--- Will you please answer the door? It _______ be your sister.
---Sorry, I ________. I'm feeding the rabbit.
| A．must；mustn’t | B．will；can’t |
| C．may；can’t | D．must；needn’t |
--- Will you please answer the door? It _______ be your sister.
---Sorry, I ________. I'm feeding the rabbit.
| A．must；mustn’t | B．will；can’t |
| C．may；can’t | D．must；needn’t |
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