THE LESSON ... FOR ME TO UNDERSTAND. A. IS VERY DIFFICULTB. TOO DI...

41. - 3500 CAU TRAC NGHIEM ON TAP AV THCS
3500 CAU TRAC NGHIEM ON TAP AV THCS

41. The lesson ... for me to understand.

a. is very difficult

b. too difficult

c. difficult too

d. is too difficult

 d