问题补充：
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：
A. give up
(答案→)B. work out
C. look through
D. think of
解析：本题的含义应该是他们几次尝试解决这个问题，最后成功了，work out表示解决的意思，与句意较符合，故选B。
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