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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单项选择题
Please remind him ______ taking an umbrella with him.
A．with
B．of
C．to
D．for
单项选择题
They decided to take some actions ______ the situation turned too bad.
A．until
B．unless
C．when
D．before
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