单项选择题

It was recommended that they ______ for the doctor.

A．has waited
B．waited
C．should wait
D．should have waited
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This town is famous ______ its historical homes.
A．for
B．about
C．with
D．by
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We don't know what the surface of Venus might ______.
A．look as
B．look like
C．look over
D．look about
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