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
He admires Mrs. Brown, ______ I find strange.
A．which
B．who
C．that
D．in which
单项选择题
Some people get used ______ and it is hard for them to stop.
A．to smoke
B．to smoking
C．smoking
D．for smoking
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