问题
单项选择题
It's a very kind offer, but I really（）accept it.
A. mustn't
B. needn't
C. can't
D. don't
答案
参考答案：C
解析：
mustn't语气强，“禁止”；needn't表示“不必”，常做must问句的回答：can't“不能”；don't助动词，无实意；通过句意可知答案为C。
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