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
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The new constitution will take ______ from the beginning of July.
A．effect
B．position
C．place
D．post
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America is waging a war against terrorism ______ a large scale.
A．at
B．to
C．with
D．on
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