Will you stay for lunch?Sorry,______.My brother is coming to see me.A.I mustn’t B.I can

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Will you stay for lunch?Sorry,______.My brother is coming to see me.A.I mustn’t B.I can

应填''I can't."".
原因:从下文得知,我不能留下来吃晚餐,因为哥哥要到我家看望我.can't表示不能够(客观原因造成做不到);而mustn't表示不应该(主观认为不应该);

I can`t

选A

i won't