题目内容
—It ________Bill who repaired the door yesterday.
—No, it ___by him. He went home last week.
A. might be, can’t have been done B. may be, mustn’t have been done
C. must be, couldn’t have been done D. can be, mayn’t have been done
C
前句是强调句。后句是对过去情况的推测。
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