【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】如果新的安全系統(tǒng)被投入使用，這個(gè)事故本就不會(huì)發(fā)生．根據(jù)句意可知，考查虛擬語氣．跟故去事實(shí)相反，從句用had done，主句用would have done，再結(jié)合new safety system 是被投入使用，故用had been done，即答案為A．

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