--- Tony, you must have noticed the student who broke the glass．
--- I’m sorry．I attentively．
A. studied
B. was studying
C. am studying
D. would study
网友回答
A. studied
(答案→)B. was studying
C. am studying
D. would study
解析：
这题考查时态：句意是：--托尼，你一定注意是谁打坏了杯子。--对不起，我当时正在认真学习。说明在别人打坏杯子时，我正在专心学习。选B。