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)生們之前必須要進行仔細檢查．

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"是分詞短語用作時間狀語，其中的定語從句"where they           to contain cancer-causing dyes"用來修飾先行詞an accident，意為：在這一事件中，它們被發(fā)現(xiàn)含有致癌染料；該從句中的主語是they即指上一句提到的School uniforms，與為謂語discover構(gòu)成被動關(guān)系，所以此處需要使用被動語態(tài)；根據(jù)句中的時間狀語last month（上個月），因此這里要用一般過去時態(tài)的被動語態(tài)（were discovered ）．故選C

點評 本題考查了一般過去時態(tài)的被動語態(tài)．做此類題時需要注意兩點：一是首先要根據(jù)句意來判斷主語與謂語動詞是否構(gòu)成被動關(guān)系；二是句中要有表示過去的時間狀語，或根據(jù)語境可以判斷出該動作或狀態(tài)是發(fā)生在過去；具備以上兩點就要用一般過去時態(tài)的被動語態(tài)，即was/were+動詞的過去分詞．

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