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I think is C.5.39.217.77( D  n' r, K0 o" B" K/ e1 g2 o
公仔箱論壇' V9 m, O7 J2 u9 _3 _5 @
Since A & B will have no way to know, and D did not know the answer.
; h2 }/ o0 s  Z) Q  ?8 Y5.39.217.776 A  a9 I% t' D
This is a tough question for grade 1.  
: l) i; |; O& [2 f9 }* J; V% M公仔箱論壇TVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。. T$ H( r  o% q/ x& k; V& X+ }  W
I most likely cannot answer it within 5 minutes when I was that young.公仔箱論壇4 ~5 r# ]0 k6 e5 `( j

  f+ @' p1 j5 a( iTVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。Wow, really enjoy this question.  Thank you for sharing.