题目内容：
My parents often tell me that I ought to (study)_____________hard.参考答案：【答案仅供学习，请勿对照自行用药等】
答案解析：
简答题：My parents often tell me that I ought to (study)____________
- 题目分类：英语三级B级
- 题目类型：简答题
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Doctor Green went on with his experiment on human being ____
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