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
考查虛擬語氣。根據(jù)句中but for (要不是)得知條件，要不是交通繁忙，警察就不能抓住企圖逃跑的賊了。couldn’t have done 本不能做……卻做到了。
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