I’ve taken someone else’s green sweater by mistakes. It ______ Harry’s. He always wears green..
A．could beB．will beC．mustn’t beD．has to be
A

這題考查情態(tài)動詞表示猜測的用法，句意是：我錯拿了別人的綠毛衣，可能是亨利的，他總是穿綠色的。Could be表示“可能是”。選A。
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