【題目】Mary _______ have arrived ten minutes earlier but her flight was held up because of the heavy fog.

A. need B. can C. should D. must

【答案】C

【解析】

試題分析：考查情態(tài)動詞和虛擬語氣。句意：瑪麗本應(yīng)該十分鐘前到，但她乘坐的航班因大霧而延誤了。情態(tài)動詞+have done可以表示對過去事情進行推測，need have done本來需要做某事；can/can’t have done(不)可能已經(jīng)做了某事；must have done一定已經(jīng)做了某事；should/shouldn’t have done本(不)應(yīng)該做某事。這里指的是“本應(yīng)該早點到”，故選C。

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