【題目】If the new safety system _______ to use, the accident would never have happened.

A. had been put B. were put C. should be put D. would be put

【答案】A

【解析】試題分析：句意：如果這個(gè)新的安全系統(tǒng)被投入使用過(guò)的話(huà)，這個(gè)事故就不會(huì)發(fā)生了。根據(jù)主句確定是對(duì)過(guò)去情況的虛擬，所以從句謂語(yǔ)用had done形式，此外根據(jù)句意可知是被動(dòng)，用被動(dòng)語(yǔ)態(tài)，故A項(xiàng)是正確的。

if從句的謂語(yǔ)動(dòng)詞

主句謂語(yǔ)動(dòng)詞

1.與現(xiàn)在事實(shí)相反

動(dòng)詞過(guò)去式（be一律用were）

would/could/might/should+動(dòng)詞原形

2.與過(guò)去事實(shí)相反

had done

would/could/might/should+have done

3.與將來(lái)事實(shí)可能相反

a.動(dòng)詞過(guò)去式（be一律用were）

b.should+動(dòng)詞原形（不能用would）

c.were to+動(dòng)詞原形

would/could/might/should+動(dòng)詞原形

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