题目内容

---Must I clean the Lable now?
---No, you ____. You may do it later

B
考查must的否定回答.句意:我必须现在就打扫实验室吗?_不,你不必.你可以稍后打扫.must 提问的回答，可用needn’t /don’t have to，故选B

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