where引导主语从句:
where he comes from is unknown. 他从哪里来还不清楚。
where宾语从句:
i want to know where he comes from. 我想知道他从哪里来。
which引导定语从句:
the city which i want to visit is Dalian. 我想参观的城市是大连。
where引导表语从句:
the question is where he comes from? 问题是他从哪儿来。
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