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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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
单项选择题
The old man and his dog were ______ to each other.
A．helped
B．attached
C．formed
D．engaged
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