单项选择题

The classroom needs ______. A) clean B ) to clean C) cleaning D) being cleaned
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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
He admires Mrs. Brown, ______ I find strange.
A．which
B．who
C．that
D．in which
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