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问题: I can't 还是I won't?

41. --Will you stay for lunch?
--Sorry,_____. My brother is coming to see me.
A.I mustn't B.I can't C.I needn't D I won't
答案给的B,D为什么不能选

解答:

语气的不同,I WONT 表示不爽。前面都已经用了SORRY了,是客气的说法。接I WONT这么强硬的语气也不合适。而I CANT,隐藏句子就是I M WILLING TO ,BUT I CANT。是客气的说法。语气通顺要选B的。