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
--You've made great progress in your studies of English, haven't you --Yes, but much ().

A．remains to do
B．is remained to do
C．remains to be done
D．is remained to be done
单项选择题
It is said in the book that Thomas Edison (1847～1931 ) () the world leading inventor for sixty years.

A．would be
B．has been
C．had been
D．was
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