题目内容
【题目】
--- 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
【答案】D
【解析】根据对话的语境,打电话联系为过去,故用一般过去时态,后句为对当时的推测,用“must have been doing……”表示“当时一定在做……”。
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