语法18-5When you read this essay,please mark a mark ____you donot understand.A.in which B.where C.to which D.to where

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语法18-5When you read this essay,please mark a mark ____you donot understand.A.in which B.where C.to which D.to where
语法18-5
When you read this essay,please mark a mark ____
you donot understand.
A.in which B.where C.to which D.to where

语法18-5When you read this essay,please mark a mark ____you donot understand.A.in which B.where C.to which D.to where
B.you do not understand后面缺少地点状语,四个选项里B引导地点状语从句,所以选B

B where引导状语从句。前面不需要介词。而in和to这两个动词都不准确。在这里where=at which