12.School uniforms must be double-checked before being handed to students following an incident last month where they           to contain cancer-causing dyes.( 。
A.will be discoveredB.will discover
C.were discoveredD.discovered

分析 繼上個(gè)月它們被發(fā)現(xiàn)含有致癌染料這一事件發(fā)生之后,校服在被發(fā)給學(xué)生們之前必須要進(jìn)行仔細(xì)檢查.

解答 答案:C
分析句子結(jié)構(gòu)可知,"following an incident last month where they           to contain cancer-causing dyes"是分詞短語(yǔ)用作時(shí)間狀語(yǔ),其中的定語(yǔ)從句"where they           to contain cancer-causing dyes"用來(lái)修飾先行詞an accident,意為:在這一事件中,它們被發(fā)現(xiàn)含有致癌染料;該從句中的主語(yǔ)是they即指上一句提到的School uniforms,與為謂語(yǔ)discover構(gòu)成被動(dòng)關(guān)系,所以此處需要使用被動(dòng)語(yǔ)態(tài);根據(jù)句中的時(shí)間狀語(yǔ)last month(上個(gè)月),因此這里要用一般過(guò)去時(shí)態(tài)的被動(dòng)語(yǔ)態(tài)(were discovered ).故選C

點(diǎn)評(píng) 本題考查了一般過(guò)去時(shí)態(tài)的被動(dòng)語(yǔ)態(tài).做此類(lèi)題時(shí)需要注意兩點(diǎn):一是首先要根據(jù)句意來(lái)判斷主語(yǔ)與謂語(yǔ)動(dòng)詞是否構(gòu)成被動(dòng)關(guān)系;二是句中要有表示過(guò)去的時(shí)間狀語(yǔ),或根據(jù)語(yǔ)境可以判斷出該動(dòng)作或狀態(tài)是發(fā)生在過(guò)去;具備以上兩點(diǎn)就要用一般過(guò)去時(shí)態(tài)的被動(dòng)語(yǔ)態(tài),即was/were+動(dòng)詞的過(guò)去分詞.

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