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问题: 选择题___ at the station,John found the train had just left

___ at the station,John found the train had just left.
A On reaching B On arrival C At reaching D At arrival (B)
这里为什么用arrival呢,为什么不用动名词

解答:

on+动名词(或者由动词转化来的名词)相当于when.

所以确定用on...

reach 在作为“到达某地”意思时,是及物动词,后面不需要介词at.

arrival n 由动词arrive转化而来。同动词arrive一样,表达“到达某地”时,后面需要用介词连接地点名词。

所以就是:on arrival at the station