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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单项选择题
My father isn't ______ as he was last week.
A．busier
B．so busier
C．so busy
单项选择题
It is very important ______ us ______ to school on time.
A．to, to get
B．for, to get
C．for, remembering
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