O N E OF THE GREATEST D I F F IC U LTI E S F O R FOREIGN STUDENTS...

221. - 300 CAU TRAC NGHIEM XAC DINH LOI SAI
300 CAU TRAC NGHIEM XAC DINH LOI SAI

221. O

n e of the greatest d i f f ic

u lti

e s f o r foreign students in American universities a r e the lecture system.

a. One

b. difficulties

c. for

d. are