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

解析這題考查時(shí)態(tài)，句意是：杰克本來可以避免這場(chǎng)可怕的車禍，但是他太不仔細(xì)了。從could have done看出是“過去本可以做…卻沒有做”，那不夠仔細(xì)是過去的事實(shí)，所以選C

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