Tony TV when his mother came in.A. watchB. watchesC. was watchingD. is watching

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A. watch
B. watches
(答案→)C. was watching
D. is watching
解析：根据后面的came可知，本句应该是过去时的某种形式，故排除ABD。本句的结构是过去进行时。本句的意思是“当他妈妈进来的时候，托尼正在看电视。”所以本题选C。