I'M TIRED ... SUCH REPEATING WORK.A. TO DOB. BY DOINGC. OF DOINGD....

28. - 3500 CAU TRAC NGHIEM ON TAP AV THCS
3500 CAU TRAC NGHIEM ON TAP AV THCS

28. I'm tired ... such repeating work.

a. to do

b. by doing

c. of doing

d. with doing

 c