Question

----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

D

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。