15．You'd better to work out this maths problem yourself．
A             B           C             DC．

分析 你最好自己解出這道數(shù)學題．

解答 答案：C to work out改為work out　
根據(jù)You'd better 可知此句運用了had better的句型，最好做某事應表達為had better do sth，后應該跟動詞原形，所以此處的to work out應該改為work out．故選：C

點評 此題考查固定句型的表達．做此題只要熟練掌握了had better do sth的用法即可快速做出答案．

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