It doesn't seem useful ( ) them to go on with the work.

问题描述:

It doesn't seem useful ( ) them to go on with the work.
填介词,望说明理由

填 for
It is + 形容词/ 形容词组 + for sb + to do sth 意思是"对某人来说,做.很."
翻译: 对他们来说,继续工作似乎没有用.