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Jack could have avoided that terrible car accident, but he ________ careful enough.
A.is notB.hasn’t been C.was notD.hadn’t been
C

这题考查时态,句意是:杰克本来可以避免这场可怕的车祸,但是他太不仔细了。从could have done看出是“过去本可以做…却没有做”,那不够仔细是过去的事实,所以选C
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