Many things ___ impossible in the past are quite common today .

来源：百度知道 编辑：UC知道 时间：2024/05/24 23:36:51
A.having been considered
B.to be considered
C.considering
D.considered

A
首先要确定选被动语态，因为那些事情是被人们想的，所以排除C
其次，因为是“in the past”,过去发生的事情，用分词表示的时候就应该用have done的形式
两个联合起来看，应该选A
这个句子意思是说：过去人们认为是不可能的事情，现在已经变得很平常了。

选择D
这里是非谓语动词的用法，many things 与consider 之间是被动，由in the past判断发生在过去，所以用 considered.

选D
最完整的句子应该是：
Many things which were considered impossible in the past are quite common today.
该定语从句中的时间状语“in the past”是典型的过去时的状语，因此定于从句要用过去时“which were considered impossible”

省略定于从句之后就变成
Many things considered impossible in the past are quite common today.

d