【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(yǔ)氣。句意：如果以前電腦被發(fā)明出來，更多勞動(dòng)力就會(huì)被節(jié)省下來。本句考查的是if引導(dǎo)的條件狀語(yǔ)從句的虛擬語(yǔ)氣，當(dāng)與過去事實(shí)相反的時(shí)候，從句使用過去完成時(shí)，主句使用“情態(tài)動(dòng)詞+have+done”。根據(jù)句意可知本句使用被動(dòng)語(yǔ)態(tài)，故D正確。

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