— Why! I _____ get you on the phone.

— We ______ basketball on the playground when you phoned.

A. didn't; must be playing

B. couldn't; must be playing

C. couldn't; must have played

D. didn't; must have been playing

D


解析:

解題的關(guān)鍵在第二空。must be doing表示對(duì)目前下在發(fā)生的情況的推測，而根據(jù)題干的時(shí)間提示… when you phoned，可知是談虎色變論過去情況，因此排除A、B現(xiàn)兩項(xiàng)。must have done 表示對(duì)過去已經(jīng)發(fā)生的行為進(jìn)行推測；must have been doing表示對(duì)過去正在進(jìn)行的動(dòng)作推測。句意：你打電話來的時(shí)候，我們一定在在操場打藍(lán)球呢。由此判定答案為D。

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