单项选择题

He felt helpless in a situation ______ he could not move himself.

A．where
B．which
C．that
D．while
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单项选择题
Social institutions are now being called ______ to provide assistance to the homeless.
A．up
B．in
C．upon
D．off
单项选择题
______ you a president or an ordinary person, you will be punished if you commit a crime.
A．May
B．However
C．Are
D．Be
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