The teacher_____ that his students had difficulty in Englishi grammar ,decided to give them more exa

题目

The teacher_____ that his students had difficulty in Englishi grammar ,decided to give them more examples.A knows B to know C knowing D being known
那个选项是对的,为什么?这是不是从句

答案

C,knowing 现在分词表主动,在这里修饰teacher,主句是the teacher decided to give them more examples.因为这个句子已经有了谓语decided,所以know在这里肯定要以分词的形式出现,意思是老师得知学生们语法不好,决定多给些例子.