单项选择题

______ he will leave for Beijing.

A．It will not be long before
B．It is before long that
C．It is before long
D．It was before long that
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单项选择题
______ there are a large number of chemical factories, the air is likely to be polluted.
A．That
B．Where
C．Once
D．As
单项选择题
______ man must fear when traveling in space is radiation from the sun.
A．Which
B．How
C．What
D．That
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