【題目】It’s already nine o’clock. He _______ be lost, or he would have been here then.

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

【答案】A

【解析】

句意：已經(jīng)九點了。他可能迷路了，不然他就會來了。“would+have+done”虛擬語氣，表示對過去事情的假設(shè)，意思是“本來會做”。本題考察情態(tài)動詞表示推測之意。must一定，有把握的肯定猜測；can與may意為 “可能”，can的可能性大于may, 根據(jù)后文可知，使用把握性較大的can。need需要，不表示猜測。故選：A。

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