Mum，I'm going climbing．Must I clean the room now？
No，you_____________．You can do it this evening．（ ）
A．can'tB．mustn'tC．needn't
Mum，I'm going climbing．Must I clean the room now？
No，you_____________．You can do it this evening．（ ）
A．can'tB．mustn'tC．needn't
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