题目内容
9.-Tom graduated from college at a very young age.-Oh,he ______ a very smart boy then.( )
A. | could be | B. | must be | ||
C. | should have been | D. | must have been |
分析 -Tom很小就从大学毕业了.-他那时一定是个非常聪明的孩子.
解答 答案:D.根据对话谈论的是过去的事情,表示对过去的推测用情态动词+have done,而C.should have been(过去)本应该做(却没做),不合题意,故选D.must have been 一定是,"他那时一定是个很聪明的孩子".
点评 本题考察情态动词的用法.根据时态和说话人的肯定程度选择合适的情态动词用法.
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