We are busy these days． In those days the workers had a hard

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/13 23:43:27

We are busy these days． In those days the workers had a hard time．
We are busy these days．
In those days the workers had a hard time．我在一篇文章中看见这2句话
后面一句我明白需要加介词in
我就是不明白为什么不能说 We are busy in these days
为什么第一句不加in介词的

首先第一句话We are busy these days,意为这些天我们很忙.只是粗略地指出了一个时间段.
但是第二句话 In those days the workers had a hard time．意为在那些天里工人们都很辛苦.强调了一个特定的时间段.

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