单项选择题

______ you ought to do is to see a doctor.

A．How
B．What
C．Which
D．That
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单项选择题
He went on to say that it was as important to respect others as ______ by others.
A．to be respected
B．to respect
C．being respected
D．respected
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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