11．-Why not use the computers，Jack？
-Our computers _____ by a virus，so the engineer disabled all of them．（　�。�
A．attackB．had attackedC．are attackedD．were attacked

分析 --為什么不用電腦，杰克？
--我們的電腦受到病毒的攻擊，工程師把所有的電腦都停用了．

解答 D 考查被動語態(tài)．分析題干可知句子的主語是our computers 與動詞attack之間是被動關(guān)系，根據(jù)時態(tài)前后一致可知本句用一般過去時，所以答案選D．

點評 被動語態(tài)由"助動詞be+及物動詞的過去分詞"構(gòu)成．被動語態(tài)的時態(tài)變化只改變be的形式，過去分詞部分不變．疑問式和否定式的變化也如此．掌握各種時態(tài)的被動語態(tài)是解題的關(guān)鍵．

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