He behaved nothing had happened. A. even thoughB. becauseC. althoughD. as though

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A. even though
B. because
C. although
(答案→)D. as though
解析：考查连词：A. even though即使，B. because因为，C. although虽然，D. as though好像，句意：他表现的好像什么都没有发生过。选D。