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
Come earlier next time;（）you'll be punished.

A. unless
B. until
C. otherwise
D. meanwhile
单项选择题
The experiment（）the discovery of a cure for cancer.

A. happened to
B. led up
C. resulted in
D. set up
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