单项选择题

--Mark broke his leg when he was playing football.
-- ______ was that

A．Since when
B．Since when age
C．How long
D．How long ago
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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
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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