They arrived in Shanghai____the morning of May 18th,2007.

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They arrived in Shanghai____the morning of May 18th,2007.

They arrived in Shanghai____the morning of May 18th,2007.
They arrived in Shanghai____the morning of May 18th,2007.

They arrived in Shanghai____the morning of May 18th,2007.
是on
on the morning是确定的某天
in the morning是广义上的上午,没有限定是一天,可以使长时间的早上

in

in

on

in

On 修饰过的morning用on哦~这里morning特指了某天的...所以用on

in

on,如果没有of May 18th,2007则用in