in a cold morning还是on a cold morning?

in a cold morning还是on a cold morning? 是on a cold morning 还是in a cold morning? 请问是In a cold winter morning 还是 on a cold winter morning? 是on a cold winter morning还是in? ( ) a cold morning of november,on还是in? in a very cold morning 还是用on a very cold morning,到底是用in 还是on __a cold morning on还是 in _______a cold morning A.IN B.on a cold morning 前介词用什么at还是in说错了，是at还是on He came back ____ a cold morning.用in 还是用onthanks ()a cold winter morning 为什么是on a cold night,in a sunny morning 用on a cold morning 、 on the morning of september 、 in the morning造句 susan left in a cold morning of january.(改错题) on a cold winter day,还是in a cold cold winter day为什么不用in in a cold day 还是 on a cold day 用in 还是 on如题 on a sunny morning 还是in a sunny morning同上 是on a fine morning还是in a fine morning?