there is no light on.They （）be at home.

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there is no light on.They （）be at home.
A mustn't
B can’t
C needn't
D shouldn't
选b,请具体讲解一下此题选项的各个用法,

B can’t
表示不可能做某事
这没有灯,因此他们不可能在家
mustn’t是must的否定式,表示“不应该”、“不许可”、“不准”、“禁止”等意思,语气比较强烈；后面直接跟动词原形.例如：
We mustn’t waste our time. 我们不该浪费（我们的）时间.
needn’t是动词need（需要）的否定式,表示“不需要”、“不必”的意思；后面直接跟动词原形.例如：
She needn’t come tomorrow. 她明天不必来.
should其否定句则表示过去不该做但做了的事情.例如：
You should not have gone back to work without the doctor's permission．你不应该未经医生许可就去工作.

there is no light on.They （）be at home. There's no light on --They ___be at home.A.can't B.mustn't C There's no light on.they____be at home. they must be at home -there's light _____ in the bedroom A t The light in Mrs White’s bedroom is on.She ____ be at home n He must be at home,__the light in his room is on. The engineer must be at home,for the light is on,___? -- ( )he be at home now -- Yes,he must.The light is on A.Mus 英语情态动词区别There's no light on-they______be at home.为什么用can't 而 1.The light is ( ),He must be at home.A.off B.at C.in D.on There's no light no-they______be at home.A.can't there is no one at home可以说成there is none at home吗

there is no light on.They （ ）be at home.

there is no light on.They （）be at home.