—Was the trip pleasant when you vacationed in the mountain village last summer?
—No，it for four days when we arrived，so the roads were very muddy.
A. was raining
B. would be raining
C. had been raining
D. have rained
网友回答
A. was raining
B. would be raining
(答案→)C. had been raining
D. have rained
解析：根据题意及“for four days”,应采用过去完成进行时。