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I think is C.& ]. o+ R3 p9 _
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Since A & B will have no way to know, and D did not know the answer.
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" \) A' r& L" ^3 g5 Y1 o; n* ~tvb now,tvbnow,bttvbThis is a tough question for grade 1.  
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: A3 A! s: u: H1 n- ]' x公仔箱論壇I most likely cannot answer it within 5 minutes when I was that young.
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+ _. x+ W. q1 h  C$ d& }* J5.39.217.76Wow, really enjoy this question.  Thank you for sharing.