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

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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
单项选择题
The reason（）I can't come is that my mother is ill

A．because
B．why
C．as
D．for
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