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
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单项选择题
She remembered several occasions in the past_________she had experienced a similar feeling.
A．which
B．before
C．that
D．when
单项选择题
Although he thought he was helping us to prepare the dinner, he was actually______ the way.
A．in
B．off
C．by
D．on
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