Question

【题目】—Whose book is this?
—It ___________ our geography teacher's. You see, his name is on it.
A.can't be
B.can be
C.mustn't be
D.must be

Answer 1

【答案】D
【解析】can't be不可能；can be可能是；mustn't be不允许，禁止；must be肯定是。根据句自后半句：你看他的名字在上面，推断出前句句意：他肯定是我们地理老师的。故选D 。