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.
答
A new bridge has been built by them over the river.
答
have been built
答
has been built
主语是单三