-----Why didn’t you go to the gathering yesterday?
------It rained so hard and in addition, I an important essay the whole morning.
A. wrote
B. had written
C. was writing
D. have been writing
网友回答
A. wrote
B. had written
(答案→)C. was writing
D. have been writing
解析：考查时态，句意是：--昨天你为什么不参加聚会？--雨下的很大，还有我一个早上都在写一份重要的论文。可知写论文的动作是发生在昨天早上，而且只说明是在 ，并不说明是写完了，不能用一般过去时。选C。