She promised________her son a nice present．A.buyingB.to buyingC.to buyD.bought
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C解析分析：promise(允诺)后面接动词不定式作宾语。(延伸)promise sb to do sth如：She promised her son to buy a nice present．(注意此处to buy动作仍然是she所做的)promise跟that从句，如：She promised her son that she would buy a nice present．promise可以作名词，如：She made a promise that she would buy her son a nice present．