单项选择题

Owing to space research, TV pictures can be transmitted ______.

A. live
B. alive
C. living
D. lively
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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
单项选择题
It's necessary that the problem______in some way or other．
A．is settled
B．was settled
C．be settled
D．has been settled
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