One of our rules is that every student       wear school uniform while at school.
#63503
A
might
B
could
C
shall
D
will
推荐题目
We ______ the difficulty together, but why didn't you tell me?
#63504
A
should face
B
might face
C
could have faced
D
must have faced
Mary ______ my letter; otherwise she would have replied before now. 
#63420
A
has received
B
ought to have received
C
couldn’t have received
D
shouldn’t have received
 ______ Tom be in his office so late at night ?
#74672
A
Can
B
May
C
Might
D
Must