The parents were in search _______ their son who was lost when the two countries were ______ war.A.of; inB.of; atC.for; atD.for; in
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B解析试题分析：考查固定词组。固定词组in search of 寻找…；at war在战争时；句意：当这两个国家处于战争状态的时候，这对父母正在寻找失踪的的儿子。故B正确。考点：考查固定词组
点评：固定词组in search of 寻找…；at war在战争时