--- Catherine, I have cleaned the room for you．
---Thanks．You _______ it．I could manage it myself．
| A．needn’t do | B．shouldn’t have done |
| C．mustn’t do | D．needn’t have done |
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--- Catherine, I have cleaned the room for you．
---Thanks．You _______ it．I could manage it myself．
| A．needn’t do | B．shouldn’t have done |
| C．mustn’t do | D．needn’t have done |
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