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

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