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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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
单项选择题
That young boy was knocked ______ by a passing car.
A．on
B．at
C．in
D．down
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