单项选择题

There is no doubt that he is a good professor ______ he is doing fine.

A．but
B．because
C．so
D．yet
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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
______ , 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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