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【题目】

They must have been enjoying themselves there, otherwise they ________so long.

A. cant have stayed

B. wouldnt have stayed

C. neednt have stayed

D. couldn t stay

【答案】B

【解析】句意:他们一定在那儿玩得很高兴,否则他们就不会待那么长时间了。wouldnt have stayed表示与过去事实相反的虚拟。

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