---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 outB.e outC.put outD.look out
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A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。e 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。