This chapter is so difficult to that I shall have to read it again later.A. readB. knowC.

问题补充：

This chapter is so difficult to that I shall have to read it again later.

A. read

B. know

C. find

D. digest

答案：

A. read

B. know

C. find

(答案→)D. digest

解析：本题考查动词含义。read读； know知道；find发现；digest消化，理解。这里表示这一章很难理解。故选D。