–Whose is this purple scarf?
–It _______ be Mary’s. She always wears a purple scarf like this.
| A．must | B．can |
| C．mustn’t | D．can't |
–Whose is this purple scarf?
–It _______ be Mary’s. She always wears a purple scarf like this.
| A．must | B．can |
| C．mustn’t | D．can't |
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