问题
选择题
—My goodness! The accident might not have happened if we had done it more carefully.
—But we .
A．haven’t
B．wouldn’t
C．hadn’t
D．didn’t
答案
答案：D
考查时态。根据题中用了过去事实相反的虚拟语气，故可知用一般过去时，选D。
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