单项选择题

The little girl is crying ______ she can't find her mother.

A．because
B．so
C．until
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单项选择题
hey won't go to the zoo if it ______ tomorrow.
A．snowed
B．snows
C．will snow
单项选择题
This book should be returned to the library ______ the end of this month.
A．in
B．from
C．by
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