题目内容

【题目】A set of keys __________ in the lost and found box. Are they yours?
A.have
B.be
C.are
D.is

【答案】D
【解析】句意：在失物招领箱有一串钥匙。它们是你的吗？叙述现在事情句子用一般现在时，a set of+名词复数作主语时谓语动词用单数，故选D。

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