单项选择题

That teacher is very good () children.

A．over
B．at
C．on
D．with

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单项选择题
Look () ! There's a car coming.

A．up
B．out
C．back
D．over
单项选择题
Americans have been criticized for placing too much () on being on time.

A．emphasis
B．activity
C．bother
D．assistance
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