— Is that girl in purple your sister?
— It __________ be. She’s gone to London a week before.
| A．can’t | B．won’t |
| C．mustn’t | D．needn’t |
— Is that girl in purple your sister?
— It __________ be. She’s gone to London a week before.
| A．can’t | B．won’t |
| C．mustn’t | D．needn’t |
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