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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Our department has a large collection of books, ______ are on literature.
A．many of which
B．many ones
C．many of them
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单项选择题
______ worked harder, he would have passed the exam.
A．He had
B．When he
C．If he
D．Had he
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