题目内容
【题目】—Why! I couldn't get you on the phone this morning.
—We ________ tennis in the yard when you phoned me.
A.could be playing
B.must be playing
C.must have been playing
D.should have played
【答案】C
【解析】句意:—为什么今天早上打电话找不到你?—你给我打电话的时候我们一定是在院子里打网球。must have done表示肯定做了某事;must have been doing表示当时肯定在做某事。答句强调你打电话的这个时间点我们正在做某事,所以要用must have been doing形式。故选C。
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