When a pencil is partly in a glass of water , it looks as if it__________ .
A. breaks    B, has broken     C. were broken   D. had broken
C

試題分析: as if引導(dǎo)的從句如果表示的是虛假的事情,則常用虛擬語(yǔ)氣.表示現(xiàn)在用一般過(guò)去時(shí),如果是動(dòng)詞be,無(wú)論主語(yǔ)是單數(shù)還是復(fù)數(shù)一律用were.表示過(guò)去用過(guò)去完成時(shí);表示將來(lái)用過(guò)去將來(lái)時(shí).句意:當(dāng)一支鉛筆的一部分放在水杯里,看起來(lái)好像鉛筆是斷的。根據(jù)句意可知實(shí)際上鉛筆并沒(méi)有斷。這是一個(gè)虛假的事情,且這是一個(gè)與現(xiàn)在事實(shí)相反的虛擬語(yǔ)氣,故使用were。故C正確。
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