题目内容：

We found that it was very useful to learn English well.同义We found ___to learn English well.

优质解答

填 it useful知识点延伸：find / think / feel /suppose / believe +that +it +is / was+adj+to do sth=find / think / feel /suppose / believe it +adj+to do sth ,前者是宾语从句,后者是简单句....