问题
选择题
Jack could have avoided that terrible car accident, but he ________ careful enough. [ ]
A. is not
B. was not
C. hasn't been
D. h
adn't been
答案
答案：B
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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
答案：B