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，則常用虛擬語氣.表示現(xiàn)在用一般過去時,如果是動詞be,無論主語是單數(shù)還是復(fù)數(shù)一律用were.表示過去用過去完成時;表示將來用過去將來時.句意：當(dāng)一支鉛筆的一部分放在水杯里，看起來好像鉛筆是斷的。根據(jù)句意可知實(shí)際上鉛筆并沒有斷。這是一個虛假的事情，且這是一個與現(xiàn)在事實(shí)相反的虛擬語氣，故使用were。故C正確。
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