题干
People of different countries and regions, different nationalities and cultures have formed with solidarity an Olympic family, ______they have deepened understanding and enhanced friendship.
A：whe
B：which
C：that
D：in which
答案(点此获取答案解析）
D
；② 
；③ 
；④ 
，观察你计算的结果，用你发现的规律直接写出下面式子的值： 
=