They arrived in Shanghai____the morning of May 18th,2007.清说明原因,希望能快点,我现在要

Question

They arrived in Shanghai____the morning of May 18th,2007.
清说明原因,希望能快点,我现在要

Answer 1

虽然我是读中文的,但是我还懂得一些英文.
答案是：on
一般来说,“在早上”都是“in the mornig”.但是如果morning有修饰语的话,那就得用on了,因为用on时表示特指,特指某个早上.
如,on a sunning morning“在一个晴朗的早上”