【題目】The reports went missing in 2012 and nobody them since then．

A．sees B．saw

C．has seen D．had seen

【答案】C

【解析】

試題分析：句意：那些報告于2012年丟失了，從那以后沒有人見過它們。sees單數(shù)第三人稱形式； saw一般過去時的謂語部分。has seen現(xiàn)在完成時態(tài)的謂語部分；had seen過去完成時態(tài)的謂語部分。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(biāo)志。故選C。

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