单项选择题

Through the window __________.

A．did the fresh air come
B．came the fresh air
C．did come the fresh air
D．the fresh air come
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单项选择题
Much __________ I have read has been nonsense.
A．of which
B．which
C．as
D．that
单项选择题
This is the second time that John __________ in his final exam.
A．has failed
B．fails
C．failed
D．failing
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