题目内容

Tony is busy _______ his homework.
A．doingB．doC．to doD．does
A
考查非谓语动词。句意：托尼正忙着做他的作业。现在分词作补足语表示正在进行的伴随性动作，固定句型结构be busy doing sth表示忙于做某事。故选A。
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