must的否定句?A large hole must be dug.(否定句)A large hole ______be dug.是mustn't还是needn't to?

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must的否定句?A large hole must be dug.(否定句)A large hole ______be dug.是mustn't还是needn't to?
must的否定句?
A large hole must be dug.(否定句)
A large hole ______be dug.
是mustn't还是needn't to?

must的否定句?A large hole must be dug.(否定句)A large hole ______be dug.是mustn't还是needn't to?
用mustn't
我们老师说的,不是否定回答（用needn't）

needn't
must表示“必须”的时候，否定形式是needn't，don't have to等，意思是“不必”
另：这里的need是情态动词，后面不需要to；如果need做行为动词，那么应该是don't need to
题目有问题。
而mustn't表示一定不能、禁止

应该是
A large hole needn't to be dug.
mustn't 是禁止的意思
needn't 不需要，用不着，不必的意思
1楼回答的should not be 是不应该的意思

needn't
mustn't是有禁止的意思
needn't是不需要,并没有完全禁止
例:
Must I turn on the radio?
No,you needn't.
从不会回答No,you mustn't.
所以填needn't

A large hole should not be dug.

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