---Must I water the flowers right now?
---No, you ________ . You may do it after supper.
A. mustn't             B. needn't           C. can't
B

試題分析：句意：上句我必須馬上澆花嗎？下句不，你不必，你可以吃過晚飯?jiān)谧觥τ趍ust 開頭的的一般疑問句用needn't作否定回答。故選B。
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