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