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

问题补充：

Tony TV when his mother came in.

A. watch

B. watches

C. was watching

D. is watching

答案：

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。