一道高中英语选择题,简单说原因即可.

问题描述:

一道高中英语选择题,简单说原因即可.
They've decided to have another discussion ( ) their methods of work.
A concerns B concerned C as concern D concerning

意思很明确:他们决定对工作方法再进行讨论.
首先句子已经有谓语了 have decided,因此此处只能选非谓语动词,排除了A和C.再看concern和后面的关系,是主动的关系,于是就选择D了.
现在分词和过去分词的区别就在于现在分词表示主动,过去分词表示被动.