【題目】I ________________ in the exam, but I was too careless.

A.should have been carefulB.must have been careful

C.should be carefulD.must have been careful

【答案】A

【解析】

考查情態(tài)動詞+have done的用法。句意：我本應(yīng)該在考試時仔細點，但是我太粗心了。結(jié)合語境可知，此處是虛擬語氣，考查should have done本該做某事（事實上沒做），故選A項。

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