单项选择题

______ I was walking in the street, I met an old friend of mine.

A. Until

B. After

C. As
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单项选择题
We have been good friends ______ we met at school.
A. since

B. before

C. from
单项选择题
—I don’t know ______ he will come tomorrow.—Don’t worry. If he comes, I’ll tell you.
A. whether
B. where

C. why
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