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
When spring comes, the trees are ______.
A．in a flower
B．in flowers
C．in the flower
D．in flower
单项选择题
＄500 ______ far from enough for the girl to complete even one semester at college.
A．are
B．has
C．have
D．is
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