单选题 26. —The police think your brother John stole the diamond in the museum yesterday evening.
—Oh? But he stayed with me at home the whole evening; he ______ the museum.

A、 must have been to
B、 needn't have been to
C、 should have been to
D、 couldn't have been to

【正确答案】 D

【答案解析】 回答的前句说“他整个晚上都和我待在家里”，因此他不可能在博物馆。couldn't have done不可能做了某事，或表示对过去情况的虚拟，不能做某事而做了；needn't have done没有必要做某事；must have done是对过去情况进行较为肯定的推测；should have done本应该做某事，而实际上没有做，表示虚拟。