单项选择题

My father isn't ______ as he was last week.

A．busier
B．so busier
C．so busy
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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
单项选择题
It's quite early. We ______ worry about the time.
A．mustn't
B．may not
C．needn't
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