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【題目】Much labor would have been saved if the electronic computers_____________ before.

A. had invented B. were invented

C. should have been invented D. had been invented

【答案】D

【解析】

試題分析：考查虛擬語氣。句意：如果以前電腦被發(fā)明出來，更多勞動力就會被節(jié)省下來。本句考查的是if引導的條件狀語從句的虛擬語氣，當與過去事實相反的時候，從句使用過去完成時，主句使用“情態(tài)動詞+have+done”。根據句意可知本句使用被動語態(tài)，故D正確。

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