---How often do I need to feed the birds?
---They______ food every day, or they will be hungry.
| A．must give | B．mustn’t give |
| C．must be given | D．mustn’t be given |
---How often do I need to feed the birds?
---They______ food every day, or they will be hungry.
| A．must give | B．mustn’t give |
| C．must be given | D．mustn’t be given |
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