单项选择题

Hardly ______ when the door suddenly closed.

A．they had arrived
B．they arrived
C．did they arrive
D．had they arrived
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单项选择题
We ______ last night, but we went to the cinema instead.
A．must have studied
B．might study
C．should have studied
D．would study
单项选择题
Franklin ______ learning astronomy at an early age.
A．set about
B．set out
C．set off
D．set up
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