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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He took me by ______ arm.
A．her
B．a
C．/
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______ each other for 10 years, they decided to meet this year.
A．Not having seen
B．Having not seen
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