题目

 ---- I am not able to solve some practical problems using Newton’s First Law of Motion. ----That’s just _______ most of the students are puzzled easily. A. what    B. why    C. how      D. where 答案：D 解析: where 引导的表语从句, where表示抽象的地点。句意：这正是大部分学生困惑之处。

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