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
Reading is learning, but applying is also learning and the more important kind of learning at that.
A．看书是学习，但是应用也是学习，同时更重要的学习种类是那样。
B．读书是学习，使用也是学习，而且是更重要的学习。
C．阅读是学习，但是实施也是学习，更重要的学习种类在那点上。
D．读书是学习，但使用也是学习，并且是更重要种类的学习。
单项选择题
Our department has a large collection of books, are on literature.
A．many of which
B．many ones
C．many of them
D．where
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