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

A. would be putB. were put

C. should be putD. had been put

【答案】D

【解析】

考查虛擬語氣。句意：如果新的安全系統(tǒng)投入了使用，那么這場事故永遠也不會發(fā)生了。根據(jù)語境以及主句the accident would never have happened的形式可知，該題是對過去的虛擬。表示對過去的虛擬，條件句的謂語部分應(yīng)用過去完成時態(tài)。故D選項正確。

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