问题
选择题
They tried several times to _______ the problem, and in the end they succeeded.[ ]
A. give up
B. work out
C. look through
D. think of
答案
答案：B
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They tried several times to _______ the problem, and in the end they succeeded.[ ]
A. give up
B. work out
C. look through
D. think of
答案：B