单项选择题

It was not until the accident happened ______.

A．that I realized my carelessness
B．when I realized my carelessness
C．as I realized my carelessness
D．when my carelessness has been realized
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单项选择题
I could have called you yesterday, but I ______ your telephone number.
A．didn't have
B．hadn't had
C．won't have
D．wouldn't have
单项选择题
______ last Friday, he would have got to London.
A．Would he leave
B．Had he left
C．If he is to leave
D．If he was leaving
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