it was twenty years before he returned to his home village in 1987,___two years later a modern factory was built with his help.A when B by which time C where D that 我知道是个定语从句选C.能划分下句子成分吗和说明原因吗

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it was twenty years before he returned to his home village in 1987,___two years later a modern factory was built with his help.A when B by which time C where D that 我知道是个定语从句选C.能划分下句子成分吗和说明原因吗

it was twenty years before he returned to his home village in 1987,___two years later a modern factory was built with his help.A when B by which time C where D that 我知道是个定语从句选C.能划分下句子成分吗和说明原因吗
it was twenty years before he returned to his home village in 1987,___two years later a modern factory was built with his help.
A when B by which time C where D that
我知道是个定语从句选C.能划分下句子成分吗和说明原因吗

it was twenty years before he returned to his home village in 1987,___two years later a modern factory was built with his help.A when B by which time C where D that 我知道是个定语从句选C.能划分下句子成分吗和说明原因吗
做选择题一定要读懂句意,否则一切语法知识都是枉然:
在20年前也就是1987年,他回到了家乡,随之两年后在他的帮助下,这里建起了一座现代工厂.
(“这里”也就是句子中的"where",而where也就等于 in his home village)
把从句单独拎出来看,two years later 是一个时间状语,在语法上没有影响,所以先去掉.我们再看,句子还剩下 a modern factory was built with his help ,很明显这剩下的可以独立成为一句完整的句子,不缺少任何成分.所以只有可能选择when/where 这样的副词.如果选择A,那么when会和从句中的two years later 重复,所以不能选,B也是一个道理.因为D是that 不能引导非限定性从句,所以直接排出D.

C