【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】考查虛擬語氣。句意：如果這個(gè)新的安全系統(tǒng)被投入使用過的話，這個(gè)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，所以從句用had done形式，system與put to use是動賓關(guān)系，故選A。

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