Jack could have avoided that terrible car accident, but he ________ careful enough.[ ]A. is notB. was not C. hasn't beenD. hadn't been-高中英语-n多题

◎ 题干

Jack could have avoided that terrible car accident, but he ________ careful enough.

[ ]

A. is not
B. was not
C. hasn't been
D. hadn't been

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◎ 解析

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◎ 知识点

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