--- Tom , why didn’t you answer my call yesterday afternoon?
--- Sorry , I didn't hear the phone . I ___________ asleep.

A．must be B．must have been
C．could be D．should have been

B

解析試題分析: 考查情態(tài)動詞。從對話可知此處問昨天的事，所以應(yīng)該用情態(tài)動詞+have done表示對過去的推測判斷 ，排除A、C選項(xiàng)，must have done “肯定做過某事”，should have done “本應(yīng)該做某事”，從語境判斷B選項(xiàng)正確。句意：--湯姆，昨天下午為什么不接我電話呢？---對不起，我沒聽到。我肯定是睡著了。
考點(diǎn)：考查情態(tài)動詞。

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