单项选择题

______ , this kind of disease can do great harm to people there.

A．Occurring where
B．It occurs where it is
C．Where does it occur
D．Wherever it occurs
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单项选择题
We were told that we should follow the main road ______ we reached the central railway station.
A．whenever
B．until
C．while
D．wherever
单项选择题
______ I feel pity on hurricane victims in Southeast Asia, I can't really do very much to help them but contribute my pocket money.
A．As long as
B．When
C．While
D．Even
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