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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Neither he nor I（）interested in rock music.

A．are
B．is
C．be
D．am
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The main problem right now is（）I have enough time.

A．that
B．whether
C．if
D．which
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