单项选择题

______ , that step is not safe!

A．Look around
B．Look up
C．Look out
D．Look down
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单项选择题
Seldom ______ in such a rude way.
A．we have been treated
B．have we been treated
C．we have treated
D．have we treated
单项选择题
______ gathering and storing information, the computer can also solve complicated problems.
A．Not only
B．Unless
C．Except
D．Besides
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