题目内容

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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