问题
选择题
We are sure that scientists will _____ a way to solve the difficult problem . [ ]
A. put up
B. come up with
C. look up
D. come up
答案
答案：B
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We are sure that scientists will _____ a way to solve the difficult problem . [ ]
A. put up
B. come up with
C. look up
D. come up
答案：B