单项选择题

Just take such books ______ are needed for teaching the freshmen.

A．that
B．which
C．as
D．what
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单项选择题
It is quite necessary for him ______ his responsibilities constantly.
A．to be reminded on
B．to remind about
C．to be reminded of
D．to be reminded about
单项选择题
The new constitution will take ______ from the beginning of July.
A．effect
B．position
C．place
D．post
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