单项选择题

The time will come ______ man can fly to ______ he likes in the universe.

A．how…where
B．when…wherever
C．where…where
D．what…which
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单项选择题
______ we can get rid of pollution is still a big problem.
A．Whether
B．If
C．that
D．what
单项选择题
He claims he is ______ of the fact that the company is deep in debt.
A．innocent
B．confident
C．unknown
D．ignorant
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