单项选择题

Not once since my son went to high school ______ traveling with him.

A. had I gone
B. have I gone
C. I have gone
D. I had gone
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单项选择题
The road sign is easy to read; the words ______ well.
A. make out
B. stand out
C. work out
D. turn out
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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