--- “Fail to do your homework again?”
---“Sorry, I something else and didn’t hear your assignment.”
A. thought
B. had thought
C. was thinking
D. have been thinking
网友回答
A. thought
B. had thought
(答案→)C. was thinking
D. have been thinking
解析：句意：---又没做家庭作业？ ---对不起当时我正在想它的事，没有听到你布置作业。过去某个时候这种进行，用过去进行时。A是一般过去时，只过去发生的事；B是过去完成时，指过去之过去发生的动作；D是现在完成进行时，表示从过去到现在一直进行的动作。故选C.