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

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Manythingsbeconsideredimpossibleinthepastareverycommontoday,还是Manythingsconsideredimpossibleinthepas

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
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

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
这句话的完整形式是
Many things which are considered impossible in the past are very common today,
which are considered impossible in the past 是定语从句,所以which 和 be动词可以省略掉.
如果是这种形式的话Many things be considered impossible in the past are very common today,一句话就有两个动词,一个是“be”一个是“are”是语法错误