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It's nearly six p.m.,will you have supper here?-Sorry,___.I

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It's nearly six p.m.,will you have supper here?-Sorry,___.I have many things to do.A mustn't B I can't C I needn't D I don't
在这里为什么不可用D I don't
此题应选B ,当对方问你是否在自己家吃饭时,如果你有事,应该说对不起,我不能,因为我有很多事要做(Sorry,I can't .I have many things to do.)如果用I don't 则表示我不,这看似正确的答案其实在日常应答中是错误的.