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【题目】--- 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】

考查情态动词和时态。句意:——昨晚我给你打电话了,但没人接。——对不起,我一定是睡着了。分析可知,前文提及打电话无人应答,后文解释原因:肯定当时在睡觉。must have been doing表示肯定当时正在做某事,符合语境要求。Cmust be doing表示肯定现在正在做某事,与语境不符。故选A项。

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