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问题

Scientists say it may be five years _____ it is possible to test this medicine on human patients.[ ]

A: since
B: until
C: before
D: when
正确答案是:
同类题型

How about ________ a taxi to the City Hall The concert is beginning.—Take your time. There is ______ time left.

My parents______ in HengshuiThey were born there and have never lived anywhere else.

She has ________ that I find it hard tobelieve anything bad of her

When the speaker finished his speech, he was affected to see his speech ________ with cheers and applauses from the audience. [ ]

_______ made the school proud was______ more than 90% of the students had been admitted to key universities.

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