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【题目】— John graduated from college at a very young age.

— Oh, he _________a very smart boy then.

A.could have beenB.must have beenC.should beD.might be

【答案】B

【解析】

考查情态动词+have done。句意:---约翰很年轻就从大学毕业了。---哦,那他一定是个很聪明的孩子。根据“ John graduated from college at a very young age.”可知,must have been表示对过去肯定的猜测,“过去一定做了某事”。故选B项。

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