第10章的例句: Citizens of many countries areexpressing concern THAT theenvironmental damage caused by the widespread release of greenhousegases may be impossible to reverse..
这句话,曼哈顿说是对的,但是楼主有个疑问,that引导的从句 may beimpossible~~的主语是the environmentaldamage, 但是从句里面还有个causedby,一个句子中不能有俩个动词,所以我觉得这句不对,但是曼说它是正确的,哪位大神告诉我caused by充当什么成分。