The man is seriously ill ,more than one doctor A.has been sent for b.has been looked for

分类: 作业答案 • 2021-12-03 13:06:27

问题描述：

The man is seriously ill ,more than one doctor A.has been sent for b.has been looked for
请说明原因

答

has been sent
look for 寻找,在用被动时,只有进行时一种.
being looked for .