Many things be considered impossible in the past are very common today,还是Many things considered impossible in the past are very common today为什么,如果是第二句正确的话为什么省略be

问题描述:

Many things be considered impossible in the past are very common today,还是Many things considered impossible in the past are very common today为什么,如果是第二句正确的话为什么省略be