i can't remember_____shelf i have put the book on.A.What B.which C.when D.that

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i can't remember_____shelf i have put the book on.A.What B.which C.when D.that

i can't remember_____shelf i have put the book on.A.What B.which C.when D.that
i can't remember_____shelf i have put the book on.
A.What B.which C.when D.that

i can't remember_____shelf i have put the book on.A.What B.which C.when D.that
选B,句子的意思是：我不记得把书放在哪一个书架上了?