Adam behaved he had never heard such a thing before.A. in caseB. as ifC. whileD. though

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A. in case
(答案→)B. as if
C. while
D. though
解析：考查连词：A. in case以防，B. as if如果，C. while虽然，当…时候，然而，D. though虽然，句意：Adam表现的象从来没有发生过这样的事情。选B。