【題目】——I called you last night, but no one answered.

——Sorry, I____________ sleeping.

A.need have beenB.would have beenC.must have beenD.should have been

【答案】C

【解析】

考查情態(tài)動詞+have done。句意:——我昨晚給你打電話了,但沒人接。——對不起,我一定是睡著了。這里在對過去的一件事情進行推測。固定結(jié)構(gòu):must have done表示對過去事情有把握的肯定推測。故選C。

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