单项选择题
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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单项选择题
Hardly ______when they ran toward it.
A．had the plane landed
B．did the plane land
C．the plane had landed
D．the plane landed
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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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