my grandfather grew older he lost interest in everything except fishing.A. WhileB. WhenC

问题补充：

my grandfather grew older, he lost interest in everything except fishing.

A. While

B. When

C. As

D. Since

答案：

A. While

B. When

(答案→)C. As

D. Since

解析：考查连词：A. While当…时候（表示一段时间）B. When 当…时候（表示时间点）C. As随着（表示动作同时进行）D. Since自从，句意：随着爷爷年龄的增长，他对什么都失去了兴趣，除了钓鱼。选C。