They went on to write English words after____(read)them.填什么?为什么?

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They went on to write English words after____(read)them.填什么?为什么?

They went on to write English words after____(read)them.填什么?为什么?
They went on to write English words after____(read)them.填什么?为什么?

They went on to write English words after____(read)them.填什么?为什么?
第一,After 有介词的用法,这时候其后可直接加介词宾语.名词、动名词、某些代词 以及名词性从句 等可以做宾语.
例如,after graduation 等同于 after graduating.这里没办法用别的方式作宾语,只好用doing的形式.
第二,当然after也有连词的用法,可连接两个句子.用法如同and.
还有别的用法,但这两种是主要用法.

They went on to write English words after reading them。after不是介词吗?