问题补充：
In the past twenty years, the sad father has been to many places-his lost son.
A. in face of
B. in favor of
C. in charge of
D. in search of
答案：
A. in face of
B. in favor of
C. in charge of
(答案→)D. in search of
解析：考查短语辨析。A面临；B支持，赞成；C负责；D寻找。句意：在过去的二十年里，这位悲伤的父亲到过许多地方寻找他失踪的儿子。故D正确。
