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—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.come outC.put outD.look out
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。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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