THE TEACHER WAS EXPLAINING THE LESSON SLOWLY AND CLEARLY _________...

31. - DE KIEM TRA ANH VAN SO 1HOT
DE KIEM TRA ANH VAN SO 1HOT

31. The teacher was explaining the lesson slowly and clearly __________ .

a. to make his students to understand it.

b. in order that his students can undertand it.

c. so as to that his students could undertand it.

d. so that his students could undertand it.