---- 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

D


解析:

 where 引導(dǎo)的表語(yǔ)從句, where表示抽象的地點(diǎn)。句意：這正是大部分學(xué)生困惑之處。

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