问题描述：
The highway was covered with snow 这里with的用法
The highway was covered with snow 这句话为什么要用with snow 怎么不用BY呢
不是应该改成The highway was covered by snow吗
The highway was covered with snow 这句话为什么要用with snow 怎么不用BY呢
不是应该改成The highway was covered by snow吗
问题解答：
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