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精英家教網 > 高中英語 > 題目詳情

They must have been enjoying themselves there,otherwise they _________ so long.?

A.can’t have stayed              B.wouldn’t have stayed?

C.needn’t have stayed    D.couldn’t stay?

B?


解析:

must have done表示對過去有把握的推測,他們一定在過去那時玩得很高興。后面是否則他們就不會待這么長時間,這里也是對過去的可能性的推測。

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