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23. Concrete operational stage is from ages 7 to 11,________ children can conserve and think logically but only with practical aids and they are no longer self-centered.
(A) during which
(B) which
(C) to which
(D) what

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最佳解!
Melissa Lai 國三下 (2014/06/08)
因為前面是時間 所以要變成during whi.....看完整詳解
4F
Chien-shu Hsu 高二上 (2013/05/27)
什麼時候which前面要加介係詞阿>"< 有時候可以只用which ，這題卻又變成要加during.....
6F
Heidi Lin 高二下 (2018/05/20)
原句為兩個句子：

Concrete operational stage is from ages 7 to 11.

Children can conserve and think logically but only with practical aids and they are no longer self-centered during the concrete operational stage(在具體運思期的期間).



用which替代the concrete operational stage，因為是"在一段時間內"所以要用"介詞+which"的方式合併兩個句子：

Concrete operational stage is from ages 7 to 11, during which Children can conserve and think logically but only with practical aids and they are no longer self-centered...


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23. Concrete operational stage is from a..-阿摩線上測驗