单项选择题

Our department has a large collection of books, ______ are in English.

A．many of which
B．many of them
C．many ones
D．their many
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单项选择题
Three new buildings ______ on the campus by the end of this year.
A．will be built
B．are going to be built
C．will have been built
D．have been built
单项选择题
It was not until the accident happened ______.
A．when I realized my carelessness
B．that I realized my carelessness
C．as I realized my carelessness
D．when my carelessness has been realized
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