单项选择题

Not until he came to China () any idea of what a panda is like.

A．does John know
B．John knows
C．did John know
D．should John know

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单项选择题
This is a place () I' ve long wanted to visit.

A．which
B．where
C．when
D．why
单项选择题
The main problem right now is () I have enough time.

A．that
B．whether
C．if
D．which
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