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
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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
单项选择题
When it was clear ______ she did not speak a word of English, I tried to talk to her using the Spanish I learned while living in Europe.
A．what
B．that
C．why
D．how
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