BOOKSCHOOSE THE WORD WHOSE UNDERLINED PART IS PRONOUNCED DIFFERENTLY...

20. - TONG HOP BAI TAP TRAC NGHIEM TU LUAN TIENG ANH LOP 12 UNIT 11 BOOKS CO DAP AN
TONG HOP BAI TAP TRAC NGHIEM TU LUAN TIENG ANH LOP 12 UNIT 11 BOOKS CO DAP AN

20. The room is too dirty. It ________ now.

a. should clean

b. should have cleaned

c. should be cleaning

d. should be being cleaned