【題目】How old _____ your sister?

A. have B. is C. are

【答案】B

【解析】句意:你的姐姐多大了?have有,實(shí)義動(dòng)詞;is是,用于主語(yǔ)是單數(shù)的時(shí)候;are用于主語(yǔ)是復(fù)數(shù)的時(shí)候。How old is/are…?是詢問(wèn)年齡的句型,主語(yǔ)your sister是單數(shù),故應(yīng)選B。

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