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题目内容 (请给出正确答案)
--I've taken someone else's green sweater by mistake.
--It __________Harry's. He always wears green.

A.has to be
B.will be
C.mustn't be
D.could be

参考答案

参考解析
解析:考查情态动词。根据“He always wears green”判断,应该选D;这里could(可能),不是过去时态而是语气委婉地表示某事情发生的可能性,表推测。
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