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
______ absurd was his manner that everyone stared at him.
A．Such
B．Too
C．So
D．Much
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单项选择题
He didn't ______ and so he failed the examination.
A．work enough hard
B．hard work enough
C．hard enough work
D．work hard enough
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