Good grades depend on good study habits. Good study habits are helpful to you throughout your education. As a successful student with good grades， you should ________.

①ask your classmates for help as soon as you find a problem

②pay attention to WHY but not the ANSWER during your study

③review your notes before doing your homework

④make a plan for your study

⑤try to study too much at one time

A：②③④

B：③④⑤

C：①②③