单项选择题

______, he could not cover the whole distance in fifteen minutes.

A．Fast as he can run
B．As he can run fast
C．if he can run fast
D．Since he ran fast
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单项选择题
Not until Mr. Smith came to China ______ what kind of country she is.
A．he knew
B．he didn't know
C．did he know
D．he couldn't know
单项选择题
It seems that there is ______ that I can't do.
A．nothing
B．anything
C．everything
D．none
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