dear prof。 wang，

　　i’m writing to ask you to excuse me for not being able to keep our appointment。 i do know that this is very impolite and must have caused you much trouble。

　　i do reckon that at present any explanation is pale and futile。 however i do not want you to misunderstand me。 on my way to your office， an old lady suddenly fainted due to heart attack on the bus。 i stopped a taxi and sent her into a nearby hospital。 i stayed there until her son came， which spoiled our appointment。

　　i am aware that our appointment is of importance。 i do hope that you would be kind enough to spare your valuable to meet me。

　　i am looking forward to hearing from you。

　　sincerely yours

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