I looked everywhere in the house a key that had been lost.
A. in searching for
B. in search of
C. to search
D. searching of
网友回答
A. in searching for
(答案→)B. in search of
C. to search
D. searching of
解析：考查短语：in search of寻找，search for 寻找，句意：在房子里我到处看了看寻找丢失的钥匙。所以选B。