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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This is a place（）I' ve long wanted to visit.

A．which
B．where
C．when
D．why
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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