问题
选择题
The maths problem was so difficult that none of us could _______. [ ]
A. try it out
B. work it out
C. look it up
D. work on it
答案
答案：B
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The maths problem was so difficult that none of us could _______. [ ]
A. try it out
B. work it out
C. look it up
D. work on it
答案：B