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
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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
单项选择题
We hadn't met for 20 years, but I recognized her ______ I saw her.
A．for the moment
B．the moment
C．the moment when
D．at the moment that
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