单选题
The description of what happens in learning process is sometimes too（ ）.
Acomplex to understand
Bdifficult to be understood
Ccomplicated to understand
Dcomplicated enough to understand
正确答案
答案解析
Complex与complicated区别：complex=made up of parts,difficult to understand or explain由许多部分组成，难以理解的，复杂的，如：a complicated problem一道难题。