单项选择题

Rejecting the urging of his physician father to study medicine, Hawking chose to ______ on math and theoretical physics.

A. impose
B. center
C. overwork
D. concentrate
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单项选择题
It has been rainy these days. It is not ______ of a day for a walk after supper.
A. much
B. so much
C. too much
D. as much
单项选择题
______ the door when a gust of wind blew the candle out.
A. He had no sooner opened
B. Hardly had he opened
C. Scarcely did he opened
D. No sooner did he open
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