问题补充：
—These Maths problems are too hard to . Can you help me?
—There are many ways, but the most important is to try your best.
A. work out
B. come out
C. put out
D. look out
答案：
(答案→)A. work out
B. come out
C. put out
D. look out
解析：此题重点考察四个短语的区别。work out 想出; 制订出; 解决; 确定。come out 出现。look out 留神 当心 注意 朝外看put out 熄灭；伸出；出版；使不方便，打扰。
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