12. (2018青海)—It's a great pity that the famous football player has gone to another club.
—Don't worry! They ________ another top star recently.
A. buy  B. bought  C. have bought
12. C【解析】考查现在完成时。句意“这位著名的足球运动员去了其他俱乐部，真是太遗憾了。”“不要担心！他们最近已经买了另一个顶级明星。”答语中的recently是现在完成时的标志词。故选C。
13. (2018哈尔滨)—Could you tell me where you found Miss Gao just now?
—Certainly. In the principal's office. They ________ happily at that time.
A. are talking  B. have talked  C. were talking
13. C【解析】考查过去进行时。句意“你可以告诉我你刚才在哪里找到高老师的吗？”“当然，在校长办公室，他们那时正高兴地交谈。”由句意可知那时正在高兴地谈话，用过去进行时。故选C。