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【題目】—How old_________ your brother?

—He's 12.

A.isB.areC.wasD.were

【答案】A

【解析】

句意:——你弟弟多大了?——他12歲。

考查系動詞及主謂一致。A. is是,一般現在時,主語是單數;B. are是,一般現在時,主語是復數或第二人稱;C. was是,一般過去時,主語是單數;D. were是,一般過去時,主語是復數或第二人稱。根據答語He's 12.可知句子時態(tài)用一般現在時,排除C、D選項,主語your brother是第三人稱單數,所以用is,排除B選項,故答案選A。

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