— 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
詞義辨析。won’t不會(huì)；shan’t不會(huì)；can’t 不能，不可以；mustn’t不應(yīng)該。句意：如果你能留下來(lái)吃午飯我們會(huì)非常感激。抱歉，我不能。我還有另一個(gè)約會(huì)。所以選C。
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