28. (2018徐州)David said that the glass was broken and warned me ________ it.
A. don't touch  B. to not touch  
C. not to touch  D. no touching
28. C【解析】考查动词不定式。句意：大卫说玻璃碎了，告诫我不要碰它。warn sb.(not) to do sth.意为“告诫/警告某人(不要)做某事”，根据句意可知他告诫我不要触摸碎了的玻璃，故选C。