14.-_____ there any students in the classroom?
-No,there aren't.But there_____ some half an hour ago.( 。
A.Are,wereB.were,areC.are,areD.were,are

分析 --教室里有學(xué)生嗎?
--不,沒有.但半小時(shí)前有一些.

解答 答案:A.考查系動(dòng)詞.句意"--教室里有學(xué)生嗎?--不,沒有.但半小時(shí)前有一些.".第一個(gè)空,根據(jù)回答there aren't,可知,應(yīng)該用復(fù)數(shù)are.第二個(gè)空,根據(jù)half an hour ago半小時(shí)前,可知應(yīng)該是一般過去時(shí)態(tài),因此用are的過去式were.答案是A.

點(diǎn)評 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)合語境,選擇合適用法,注意人稱及主語的單復(fù)數(shù)變化.

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