题目

 Checking your answers before handing in your paper can help you        mistakes. A. make    B. provide   C. avoid    D. advise 答案：C写出下列单词的相应形式。1. watch (过去式)_______________2. is (过去式)______________3. go (过去式)________________4. come (过去式)_________________5. do (过去式)________________