单项选择题

I don't doubt ______ he'll come.

A．that
B．if
C．what
D．whether
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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
单项选择题
______ we can get rid of pollution is still a big problem.
A．Whether
B．If
C．that
D．what
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