因此，今天晚上我不得不加班为明天的课做一些准备。

So I had to to do some extra work at home tonight to prepare for tomorrow's lesson.

youdao

因此，今天晚上我不得不加班为明天的课做一些准备。

So I had to to do some extra work at home tonight to prepare for tomorrow's lesson.

youdao