单项选择题

Hardly______ the helicopter______ when the waiting crowd ran toward it.

A．had; landed
B．has; landed
C．did; land
D．was; landing
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单项选择题
The student was worried about the job interview ______ he was well pre pared.
A．provided
B．unless
C．despite
D．even though
单项选择题
I know it has gone past but I just can't help______ about it.
A．to think
B．thinking
C．thought
D．to be thought
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