It has been announced that all the stude
问题:
It has been announced that all the students ____ put on masks before going to school in case they are infected with SARS virus.
A.shall
B.will
C.need
D.may
It has been announced that all the students ____ put on masks before going to school in case they are infected with SARS virus.
A.shall
B.will
C.need
D.may