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
I decided to stop and have a rest, （） I was feeling very tired.

A．moreover
B．whereas
C．so
D．for
单项选择题
It is strange that Mr. Green （） attend the meeting.

A．should have failed to
B．failed to
C．having failed
D．has failed
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