--Is red girl in the Mary?--No.It___be Mary.She is doing her homework at home.A.mustB.canC.mustn'tD.can't
问题描述：
--Is red girl in the Mary?
--No.It___be Mary.She is doing her homework at home.
A.must
B.can
C.mustn't
D.can't
答
D
--那个穿红衣服的女孩子是mary吗?
--不,那不可能是她,她正在家做作业.
can't be不可能是
mustn't 不允许