----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 |
----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 |
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