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

--- Sorry, I _______ sleeping.

A.must have been

B.would have been

C.must be

D.could be

【答案】A

【解析】

考查情態(tài)動詞和時態(tài)。句意:——昨晚我給你打電話了,但沒人接。——對不起,我一定是睡著了。分析可知,前文提及打電話無人應(yīng)答,后文解釋原因:肯定當時在睡覺。must have been doing表示肯定當時正在做某事,符合語境要求。Cmust be doing表示肯定現(xiàn)在正在做某事,與語境不符。故選A項。

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