In many countries, there are already a lot of robots ________ in factories.

充值活动已开启，快来参与吧

当前位置：初中英语 / 动词 / 动词基本形式 / 现在分词 / 词法知识

1. In many countries, there are already a lot of robots ________ in factories.

A . working B . work C . are working D . to work

相关视频

现在分词