18.You_______ a teacher.I_____ a student,my sister______ a student,too.( 。
A.am,is,areB.is,are,amC.are,am,isD.are,is,is

分析 你是一位老師.我是一名學(xué)生,我的姐姐也是一名學(xué)生.

解答 答案:C.考查系動(dòng)詞.句意"你是一位老師.我是一名學(xué)生,我的姐姐也是一名學(xué)生.".is單數(shù).a(chǎn)m通常與I連用.a(chǎn)re復(fù)數(shù).第一個(gè)空,you與are連用.第二個(gè)空.I與am連用.第三個(gè)空,sister單數(shù),因此用is.答案是C.

點(diǎn)評(píng) 考查系動(dòng)詞,is是單數(shù),are是復(fù)數(shù),am通常與I連用,要結(jié)合語(yǔ)境,選擇合適用法,注意人稱及主語(yǔ)的單復(fù)數(shù)變化.

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