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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The reason（）I can't come is that my mother is ill

A．because
B．why
C．as
D．for
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I haven't met him（）the last meeting.

A．since
B．for
C．at
D．before
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