问题描述：
it's the same pen that i lost.这就是我丢的那支笔,that能改为which不能为什么~
原题是
A：I saw a pen in the garden yesterday.B:where is it now?it's the same pen ( ) i lost.为何选that不选which
原题是
A：I saw a pen in the garden yesterday.B:where is it now?it's the same pen ( ) i lost.为何选that不选which
问题解答：
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