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
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单项选择题
Franklin ______ learning astronomy at an early age.
A．set about
B．set out
C．set off
D．set up
单项选择题
It is much easier to make a plan than it out.
A．carrying
B．carry
C．to carry
D．carried
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