【題目】— 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】

考查情態(tài)動詞+have done。句意：---約翰很年輕就從大學(xué)畢業(yè)了。---哦，那他一定是個很聰明的孩子。根據(jù)“ John graduated from college at a very young age.”可知，must have been表示對過去肯定的猜測，“過去一定做了某事”。故選B項。

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