— What ________ it be? — It can't be a m
问题:
— What ________ it be?
— It can't be a mail box, for it's moving. It ________ be a car. [ ]
A. must; must
B. can; can
C. can; must
D. must; can
— What ________ it be?
— It can't be a mail box, for it's moving. It ________ be a car. [ ]
A. must; must
B. can; can
C. can; must
D. must; can