The student said there were a few points in the essay he impossible to understand.
A. had found
B. finds
C. has found
D. would find
网友回答
(答案→)A. had found
B. finds
C. has found
D. would find
解析：句意，学生说他发现这篇文章里有几点很难理解。通过分析句子结构，可知这个句子中包含一个宾语从句。主句用的是一般过去时，从句要用相应的过去时态，所以这里用过去完成时。