【題目】The reports went missing in 2012 and nobody _____them since.
A.sees
B.saw
C.has seen
D.had seen

【答案】C
【解析】句意:那些報告于2012年丟失了,從那以后沒有人見過它們。此題解題的關(guān)鍵詞是后面的since,此處意為:從那以后。這是現(xiàn)在完成時的標志。故選C。

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