问题
选择题
--- Where is your great-grandmother __________ your mother’s side from?
--- She is from Beijing．
A．by
B．on
C．at
D．of
答案
B
题目分析：Family of grandmother and grandfather on mother's side指“外祖父，外祖母”，句意：--你外祖母从什么地方来？--她来自北京。By“通过”，at“在…地方”，of“…的”，都不能用于这个词组。选B。
