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

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单项选择题
He was so engaged（）his business that he hadn't been home for a month.

A．at
B．on
C．for
D．in
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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