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问题

With some technical problems to be solved, it may be a while _____the system is put into use[ ]

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

Our special thanks to go thousands of volunteers, without ____tireless work, none of this would be possible

In such hot weather, the new plant will have to be protected from the sun if they ______.

What does the notice on the wall say — “No person _____ take books out of thereading room; otherwise he _____ be fined”

While working outdoors,Linda was________by the heat and fell to the ground,unconscious

I can’t play _______ piano, but I play _______ football very well.

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