I CAN’T FIND MY BOOK ANYWHERE. I ……. HAVE LEFT IT ON THE TRAIN. I...

21. - KIEM TRA 45'''' LOP 10 HK2
KIEM TRA 45'''' LOP 10 HK2
21. I can’t find my book anywhere. I ……. have left it on the train. I am not sure. A.

might

B.

should

C.

Must

D.

needn’t