There's no light on.they____be at home.
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There's no light on.they____be at home.
A:can't B:mustn't C:needn't D:shouldn't
为什么用can't,而不用mustn't.mustn't不是表推测吗?
A:can't B:mustn't C:needn't D:shouldn't
为什么用can't,而不用mustn't.mustn't不是表推测吗?
can't 是用于否定的推测.而must是用于肯定的推测的,mustn't用于关于禁止,不允许内容的句子.
1.That must be him.He said he would come yesterday.
2.That can't be her.She has gone to London.
1.That must be him.He said he would come yesterday.
2.That can't be her.She has gone to London.
There's no light on.they____be at home.
There's no light on --They ___be at home.A.can't B.mustn't C
there is no light on.They ( )be at home.
英语情态动词区别There's no light on-they______be at home.为什么用can't 而
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