单项选择题

Though the horses got off with a good start, it was not long______ most of them were out of the race.

A. before
B. after
C. when
D. until
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Owing to space research, TV pictures can be transmitted ______.
A. live
B. alive
C. living
D. lively
单项选择题
I don't remember ______ to Professor Brown during my last visit to Harvard.
A. having introduced
B. having been introduced
C. to have introduced
D. to have been introduced
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