当先行词为situation, case, stage, point, place, spot等，且关系词在定语从句中做状语，用关系副词where或介词+where来引导定语从句，具体用什么介词要根据情况。如：I visited the factory yesterday.My father worked in the factory.
换成定语从句是I visited the factory where/in which my father worked yesterday. (因为in the factory用的是介词in)
还有stage , occasion
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