it's siad that in the 3rd century a chinese man wrote about
3个回答

in the 3rd century 在本句中作时间状语.

在英语中,时间状语的位置是最灵活的,可出现在句首、句中或句尾.区别就是,在句首时往往用逗号隔开,其余则不用.

以 at last 为例:

At last,he finished the work.(句首)

He at last finished the work.(句中)

He finished the work at last.(句尾)