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But for the heavy traffic, the police ___ the thieves who tried to escape in the stolen car.
A.would not catchB.couldn’t have caughtC.haven’t caughtD.couldn’t catch
B
考查虚拟语气。根据句中but for (要不是)得知条件,要不是交通繁忙,警察就不能抓住企图逃跑的贼了。couldn’t have done 本不能做……却做到了。
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