单项选择题

I doubt ______.

A．whether he can come
B．if he can come or not
C．while he will be here
D．that he will come
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单项选择题
You might have ______ the accident if you had had your headlights on.
A．missed
B．avoided
C．escaped
D．dismissed
单项选择题
______ for your help, we'd never have been able to get over the difficulties.
A．Had it not
B．If it were not
C．Had it not been
D．If we had not been
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