they have built a new bridge over the river改为被动语态A new bridge _____ _____ _____ by them over the river.

问题描述:

they have built a new bridge over the river改为被动语态
A new bridge _____ _____ _____ by them over the river.

A new bridge has been built by them over the river.

have been built

has been built
主语是单三