单项选择题

The shortage of energy is getting worse. It ______ an immediate solution.

A．calls off
B．calls up
C．calls for
D．calls at
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单项选择题
With the flowers ______ everywhere, the park looks beautiful.
A．to bloom
B．blooming
C．be blooming
D．to be blooming
单项选择题
______ is known to us all, the earth moves around the sun.
A．Because
B．For
C．So
D．As
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