2018届高考英语二轮复习疯狂专练26：模块6Unit1-3(含解析)-12999学习资源网(手机版)

2018届高考英语二轮复习系列之疯狂专练26：模块6 Unit1-3(含解析)

1.【2017・北京卷】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】句意：如果这个新的安全系统被投入使用过的话，这个事故就不会发生了。根据主句确定是对过去情况的虚拟，所以从句谓语用had done形式，此处根据句意可知是被动，用被动语态，故选A。