问题补充：
--- What do you think of this novel?
--- Er … sorry. I . What did you say?
A. didn’t listen
B. hadn’t listened
C. haven’t listened
D. wasn’t listening
答案：
A. didn’t listen
B. hadn’t listened
C. haven’t listened
(答案→)D. wasn’t listening
解析：句意：你认为这篇小说怎么样？对不起，我刚才没有在听，你说什么？。表过去正在做某事。故选D
