单项选择题

Look () ! There's a car coming.

A．up
B．out
C．back
D．over

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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

单项选择题

()you become famous your private life comes under public scrutiny.

A．However
B．Once
C．Whatever
D．Until

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