问题
选择题
--- Had we been more careful, the accident might not have happened.
--- But we _____ at that time.
A．hadn’t
B．didn’t
C．weren’t
D．might not
答案
答案：C
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--- Had we been more careful, the accident might not have happened.
--- But we _____ at that time.
A．hadn’t
B．didn’t
C．weren’t
D．might not
答案：C