in a rainy day还是on a rainy day?He returned_____ a rainy day

in a rainy day还是on a rainy day?He returned_____ a rainy day in a rainy day还是on a rainy day? in a rainy day or on a rainy day,为什么 in rainy day还是on rainy day the accident happened on a rainy day. it is a rainy day Provides for a rainy day save for a rainy day He prefers ___at home ____out on such a rainy day. It's a rainy day.(rainy day划线提问) 英语作文A Story on a rainy day 英语小作文a rainy day