this is the classroom ____ i used to study beforeA what B who C which D where

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thisistheclassroom____iusedtostudybeforeAwhatBwhoCwhichDwherethisistheclassroom____iusedtostudybefor

this is the classroom ____ i used to study beforeA what B who C which D where
this is the classroom ____ i used to study before
A what B who C which D where

this is the classroom ____ i used to study beforeA what B who C which D where
D where
如果选which必须是 in which

答案选D where 引导地点状语从句