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问题: 语法结构问题

The problem daunting contemporary society is that egoism as run wild.
这个as run wild是什么成分?用as running wild对不对?

解答:

从属连词that引导的应该是表语从句,所以后面应为
egoism has run wild.而非egoism as run wild.

that作为表语从句的引导词在该表语从句中不充当句子成分, 一般不能省略,但也有省略的例子:
  The truth is(that)I didn't go there. 事实是我没去那儿
,