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
I was just talking to Margaret when Jackson ______.
A．cut in
B．cut down
C．cut out
D．cut up
单项选择题
It was said that not until the old man had passed away ______ to his relatives.
A．she let out the secret
B．was the secret let out
C．out she let the secret
D．out let the secret
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