单项选择题

Not until I came to China ______ what kind of country it is.

A．I knew
B．I didn't know
C．I did know
D．did I know
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单项选择题
I have two friends but ______ of them likes to go fishing with me.
A．none
B．neither
C．both
D．either
单项选择题
There is no hurry. You can take your time ______ those exercises.
A．doing
B．to do
C．done
D．to be doing
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