Must I clean the floor now?(A) No,you mustn't.(B) No,you needn't.并说明理由

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Must I clean the floor now?(A) No,you mustn't.(B) No,you needn't.并说明理由
Must I clean the floor now?
(A) No,you mustn't.
(B) No,you needn't.
并说明理由

Must I clean the floor now?(A) No,you mustn't.(B) No,you needn't.并说明理由
选B
must的疑问句肯定回答都是yes you must.否定都是no you needn't
mustn't的意思是不允许的意思

B MUST开头否定用NEEDN'T

B No,you needn't这是固定式了记住就行。。
No,you mustn't.
是不被允许，禁止的意思

no you needn't
need not - use it here which means..need not to clean the floor

选B，因为mustn't意思是禁止做某事

B
不必的意思
mustn't是必须不的意思

绝对的B，A前后不符合的。

B
就是这样的用法

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