单项选择题

Hurry up. My mother ______ for us in the zoo.

A．must wait
B．should be waiting
C．must be waiting
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单项选择题
The teacher decided to send ______ the boy from school.
A．for
B．away
C．up
单项选择题
My litter sister is only five, ______ she can swim well.
A．but
B．so
C．because
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