用适当的介词填空.We should wash our hands ( ) meals.I often ask Mr Zhang ( ) some science problems.

分类: 作业答案 • 2021-12-19 14:52:01

问题描述：

用适当的介词填空.
We should wash our hands ( ) meals.
I often ask Mr Zhang ( ) some science problems.

答

同意上一位的说法。before about

答

before:在吃饭之前；
about：关于一些科学问题