Doubting that the traveler carried drugs, the Customs officer stopped him and his suitcase, but found nothing at all.
A. looked up
B. went through
C. searched for
D. referred to
网友回答
A. looked up
(答案→)B. went through
C. searched for
D. referred to
解析：
试题分析:考查动词短语。A 抬头看，查阅；B仔细查找，经历；C 寻找；D参考，查阅。根据情理可知怀疑一个人携带毒品，就应该对他进行检查，所以B选项正确。句意：怀疑这个旅客携带有毒品，海关官员拦住他仔细检查他的手提箱，但是什么也没发现。