teacher is ____the new lesson while we are ___ the exam.关于preparing 和preparing for 的填空.

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teacher is ____the new lesson while we are ___ the exam.关于preparing 和preparing for 的填空.
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teacher is ____the new lesson while we are ___ the exam.关于preparing 和preparing for 的填空.
teacher is ____the new lesson while we are ___ the exam.关于preparing 和preparing for 的填空.

teacher is ____the new lesson while we are ___ the exam.关于preparing 和preparing for 的填空.
分别是preparing 和 preparing for
这个用汉语解释就怪怪的.
后面一个可以理解为为了考试而准备吧
前面一个就不能理解为为了课而准备- -
大概就是这个意思