—Whose book is this? — It _______ our 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 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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