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．that he knew
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单项选择题
Look, what you have done! You ______ must have been move careful.
A．must
B．might
C．should
D．would
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单项选择题
She's going to the hairdresser's ______.
A．to have her hair cut
B．to have her hair cutting
C．to have her hair to cut
D．to have cut her hair
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