单项选择题

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

A. unless
B. until
C. otherwise
D. meanwhile

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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
单项选择题
Till now the problem is far from （）

A. being solved
B. solving
C. being solving
D. solved
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