单项选择题

Please ______ before you cross the road.

A． look up
B． look around
C． look at
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单项选择题
There is ______ on Channel 6, please try to find it.
A． important something
B． something important
C． important anything
单项选择题
The two old women ______ each other since 1980.
A． didn't seen
B． don't see
C． haven't seen
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