单选题 Would all participants in this year's convention please complete their confidential ______ and place them in the boxes provided before leaving today?

【正确答案】 D
【答案解析】横线处需要填入充当complete(完成)宾语的名词。(B)evaluator和(D)evaluations都是名词，将它们一一代入后分析全句。与complete语意最连贯的是(D)evaluations(评估)。其实，只要清楚them指代的是横线处所填的名词，就能判断答案是复数形式的(D)。