Suspecting the traveler of carrying drugs, the Customs official stopped him and suitcase, but found nothing at all.
A. looked up
B. went through
C. searched for
Dreferred to
网友回答
A. looked up
(答案→)B. went through
C. searched for
D. referred to
解析：短语辨析。 A.查阅 B. 穿过；仔细检查 C. 寻找 D. 涉及。句意：由于怀疑这个旅客携带毒品，海关官员拦住了他，仔细坚持行李，但是根本没有发现任何东西。故选B。