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【题目】— ________ they Peter and Tim?— Yes, Lisa ________ their mother.
A.Are; are
B.Is; is
C.Are; is
D.Is; are

【答案】C
【解析】句意:-他们是Peter和Tim吗?-是的,Lisa是他们的母亲。are是,用于主语是复数或第二人称you的时候;is是,用于主语是单数的时候。第一个空后的主语是they,故用复数are;第二个空前的主语Lisa是单数形式,故用is。选C。

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