I have had great trouble _______what he said,as my English listening is rather poor.A.to understanding B.understanding. Cwith understanding D.by understanding

I have had great trouble _______what he said,as my English listening is rather poor.
A.to understanding B.understanding. Cwith understanding D.by understanding

b
have trouble doing sth
have trouble with sth
做某事有困难

B.understanding
have trouble doing sth句型，做某事有困难
祝你进步

A
have trouble (in) doing sth 做...事有麻烦

B。。
to后面一定要是understand..（基本词）
had 了可以直接放词-ing..