－What do you think we can do for our aged parents?
－You_______ do anything except to be with them and be yourself.
| A．don’t have to | B．oughtn’t to | C．mustn’t | D．can’t |
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－What do you think we can do for our aged parents?
－You_______ do anything except to be with them and be yourself.
| A．don’t have to | B．oughtn’t to | C．mustn’t | D．can’t |
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