问题
选择题
— How long will it _____ man can find another planet like the earth?
— Ten years or longer.[ ]
A. since
B. after
C. until
D. before
答案
答案：D
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— How long will it _____ man can find another planet like the earth?
— Ten years or longer.[ ]
A. since
B. after
C. until
D. before
答案：D