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— We would appreciate it if you could stay for lunch.
— Sorry, I         . I have another appointment.  
A.won’tB.shan’tC.can’tD.mustn’t
C
词义辨析。won’t不会;shan’t不会;can’t 不能,不可以;mustn’t不应该。句意:如果你能留下来吃午饭我们会非常感激。抱歉,我不能。我还有另一个约会。所以选C。
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