【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：如果這個新的安全系統(tǒng)被投入使用過的話，這個事故就不會發(fā)生了。根據(jù)主句確定是對過去情況的虛擬，所以從句謂語用had done形式，此外根據(jù)句意可知是被動，用被動語態(tài)，故A項是正確的。

if從句的謂語動詞

主句謂語動詞

1.與現(xiàn)在事實相反

動詞過去式（be一律用were）

would/could/might/should+動詞原形

2.與過去事實相反

had done

would/could/might/should+have done

3.與將來事實可能相反

a.動詞過去式（be一律用were）

b.should+動詞原形（不能用would）

c.were to+動詞原形

would/could/might/should+動詞原形

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