Early__the morning of May 1, we started off___the mountain vallage. 为何选A:in;for,为什么?谢谢

问题描述:

Early__the morning of May 1, we started off___the mountain vallage. 为何选A:in;for,为什么?谢谢
on a rainy morning, on a sunny morning, on Sunday morning,
为何 用on?而in the morning of May 1用in。

因为是May 1 的早晨,是特定的一天,所以用on.只要是几月几号,如3月1号之类的,都要用on