Children should be instructed to put things they belong in their early childhood.A. where

问题补充：

Children should be instructed to put things they belong in their early childhood.

A. where

B. in which

C. to which

D. what

答案：

(答案→)A. where

B. in which

C. to which

D. what

解析：句意“儿童应该在童年早期就被教导把东西有条理地放置。”“把东西放在原先的地方”，暗含的是地点，故用where。故选A。