问题标题:
Tomsits()theclassroomwhileJohnsits()theroomAinfrontof;atbackofBinthefrontof;atthebackofCinfrontof;atthebackofDinthefront;atbackof
问题描述:

Tomsits()theclassroomwhileJohnsits()theroom

Ainfrontof;atbackof

Binthefrontof;atthebackof

Cinfrontof;atthebackof

Dinthefront;atbackof

崔中发回答:
  Binthefrontof;atthebackof
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