21. Mary was too ready to help others, seldom, , refusing them when they turned to him.
A. if never B. if not C. if any D. if ever
22. The Philipines ought to know that, ________, the situation would get worse.
A. unless dealing with carefully B. unless carefully dealt with
C. if not carefully dealing with D. if dealt not carefully with
23. We should try our best to solve the problems that we are meeting with _____ things get worse.
A. when B. unless C. before D. once
24. I had been puzzled over the problem for over an hour without any result, _______ all at once the solution flashed across my mind.
A. while B. when C. then D. as
25. —Look. The paint is starting to come off the wall is damp.
—Well, we'd better have the wall repainted some day.
A. when B. where C. if D. once
26. The apartment I ended up renting was really nice, _____ it was kind of small.
A. now that B. even though C. no matter how D. ever since
27. I don't believe we've met before, I must say you do look familiar.
A. therefore B. although C. since D. unless
28. hard you try, it is difficult to lose weight without cutting down the amount you eat.
A. However B. Whatever C. Whichever D. Whenever
29. No matter how frequently , the works of Beethoven still attract people all over the world.
A. performed B. performing C. to be performed D. being performed
30. _______ I can see, there is only one possible way to keep away from the danger.
A. As long as B. As far as C. Just as D. Even if
21. D。if ever表示频度，“如果曾经发生过的话”；if any强调数量，“如果有的话”。
22. B。unless carefully dealt with是条件状语从句的省略，相当于unless it is carefully dealt with。
23. C。before这里译作“趁……还没有”。
24. B。这是had done…when…句型，when引出一件出乎预料的事情。
25. B。where引导地点状语从句，“在……潮湿的地方”。
26. B。now that因为；even though即使；no matter how 无论怎么；ever since自从……以来。
27. B。although引导条件状语从句，表示“虽然，尽管”。
28. A。However引导让步状语从句，后面要紧跟形容词或副词。
29. A。No matter how frequently后面省略了they are。
30. B。As far as I can see就我所看到的而言。as long as只要……就；even if即使。
A. if never B. if not C. if any D. if ever
22. The Philipines ought to know that, ________, the situation would get worse.
A. unless dealing with carefully B. unless carefully dealt with
C. if not carefully dealing with D. if dealt not carefully with
23. We should try our best to solve the problems that we are meeting with _____ things get worse.
A. when B. unless C. before D. once
24. I had been puzzled over the problem for over an hour without any result, _______ all at once the solution flashed across my mind.
A. while B. when C. then D. as
25. —Look. The paint is starting to come off the wall is damp.
—Well, we'd better have the wall repainted some day.
A. when B. where C. if D. once
26. The apartment I ended up renting was really nice, _____ it was kind of small.
A. now that B. even though C. no matter how D. ever since
27. I don't believe we've met before, I must say you do look familiar.
A. therefore B. although C. since D. unless
28. hard you try, it is difficult to lose weight without cutting down the amount you eat.
A. However B. Whatever C. Whichever D. Whenever
29. No matter how frequently , the works of Beethoven still attract people all over the world.
A. performed B. performing C. to be performed D. being performed
30. _______ I can see, there is only one possible way to keep away from the danger.
A. As long as B. As far as C. Just as D. Even if
21. D。if ever表示频度，“如果曾经发生过的话”；if any强调数量，“如果有的话”。
22. B。unless carefully dealt with是条件状语从句的省略，相当于unless it is carefully dealt with。
23. C。before这里译作“趁……还没有”。
24. B。这是had done…when…句型，when引出一件出乎预料的事情。
25. B。where引导地点状语从句，“在……潮湿的地方”。
26. B。now that因为；even though即使；no matter how 无论怎么；ever since自从……以来。
27. B。although引导条件状语从句，表示“虽然，尽管”。
28. A。However引导让步状语从句，后面要紧跟形容词或副词。
29. A。No matter how frequently后面省略了they are。
30. B。As far as I can see就我所看到的而言。as long as只要……就；even if即使。
