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
The old man and his dog were ______ to each other.
A．helped
B．attached
C．formed
D．engaged
单项选择题
I decided to stop and have a rest, ______ I was feeling very tired.
A．moreover
B．whereas
C．so
D．for
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