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
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单项选择题
It seems that there is ______ that I can't do.
A．nothing
B．anything
C．everything
D．none
单项选择题
The brain is capable of ignoring pain messages if ______ to concentrate on other activities.
A．it allowed
B．is it allowed
C．allowed
D．allowed it
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