--- Oh! You bumped me!
--- I am sorry. But I to catch the ing bus.
A. try
B. tried
C. am trying
D. was trying
网友回答
A. try
B. tried
C. am trying
(答案→)D. was trying
解析：考查情景交际和时态。句意：--噢！你撞到我了！--对不起。我（刚才）正在赶公交车。根据情景可知，是刚才发生的事情，应该用过去的某种时态，强调过去某一时刻发生的事情，用过去进行时，故选D。