30.They ______ be at home. You see, the
题型:选择题
问题:
30.They ______ be at home. You see, the door is locked from the outside.
A.can’t
B.may
C. must
D. mustn’t
30.They ______ be at home. You see, the door is locked from the outside.
A.can’t
B.may
C. must
D. mustn’t