题目内容
-- 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
D
解析: 此题考查了情态动词的用法。Could be表示“一种不确定的猜测”。这也在句子后面的He always wars green可以看出的。
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