单项选择题

The children are standing ______ the starting line and are ready ______run.

A．at; to
B．at; for
C．in; to
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单项选择题
______! May I borrow your bike
A．Excuse me
B．I'm sorry
C．Let me say
单项选择题
Today his room is ______ as usual.
A．so dirty
B．as dirty
C．more dirty
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