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The reports went missing in 2012 and nobody _____them since.
A.seesB.sawC.has seenD.had seen
C

试题分析:考查动词时态。句意:那些报告于2012年丢失了,从那以后没有人见过它们。此题解题的关键词是后面的since,此处意为:从那以后。这是现在完成时的标志。故选C。
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