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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The main problem right now is ______ I have enough time.
A．that
B．whether
C．if
D．which
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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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