---Whose book is this? ---It________ be
题型:选择题
问题:
---Whose book is this?
---It________ be Ning’s because it has her name on it.
A.must
B.can’t
C.might
D.could
---Whose book is this?
---It________ be Ning’s because it has her name on it.
A.must
B.can’t
C.might
D.could