单项选择题

He had already walked three or four miles ______ he saw a cart, half-full of hay, by the side of the road.

A．while
B．when
C．the moment
D．unless
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单项选择题
In the coal mine disaster, most of the workers were killed but John ______ have a narrow escape.
A．could
B．would
C．was able to
D．can
单项选择题
On top of the mountain ______, around which were green thick trees.
A．did we see an old temple
B．an old temple stood
C．we saw an old temple
D．stood an old temple
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