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

31. - 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

31. It wasn't obligatory to submit my assignment today.

a. My assignment must have been submitted today.

b. I needn't have submitted my assignment today.

c. My assignment was required to submit by today.

d. I mustn't submit my assignment today.