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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The women carrying babies come in first, ______
A．will you
B．will they
C．do you
D．don't you
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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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