He reached Beijing in 1998,____, some time later,he became a

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He reached Beijing in 1998,____, some time later,he became a professor．
为什么是where在线上~~~?

因为这个句子不要那条线已经是个完整的句子了,所以它只能补充状语的成分.
那么你分析这个句子的意思:他在1998来到了北京,过了一段时间后,他成为了一名教授.
状语一般说明地点、时间、原因、目的、结果、条件、方向、程度、方式和伴随状况等.
我猜你在这里肯定是疑惑为什么不选when.很显然,前后两个分句的时间点不同,一个是1998年,一个是1998年之后的一段时间.用when的话是指带前面一句的时间,然后后面一句发生在同时.那就相互矛盾了意思不通.而且后面已经有了some time later这个时间状语,再用when,只会指代不明.所以只能用where,代表in Beijing,说明he became a professor也是在前面提到的北京这个地方发生的事情.

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