She was busy________when the telephone rang．A.cookB.cookingC.with cookingD.to cook
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B解析分析：少量的“be+形容词”后面的动词要用doing形式，常见的有be busy doing sth(忙于做某事)，be worth doing(值得做)。(延伸)be busy with sth(忙于做某事)和be busy doing意思相同。介词后面的动词要用doing结构，但此处已经有了be busy doing的形式，所以不会出现be busy with doing的形式。原句＝She was busy with the cooking when the telephone rang．(the cooking是名词形式)