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12.The reports went missing in 2012and nobody ______ them since.( 。
A.seesB.sawC.has seenD.had seen

分析 那些報告于2012年丟失了,從那以后沒有人再見過它們.

解答 答案C.本題主要考查動詞時態.句意強調過去報告的丟失對現在的影響和結果就是再也沒人看到過那些報告,故用現在完成時.此題解題的關鍵詞是后面的since,此處意為:從那以后.這是現在完成時的標志.故選C.

點評 時態題的考查關鍵是抓住句子的上下文含義和句中的時間狀語.要根據時間狀語來選擇合適的時態,在平時的學習中要注意積累有關時態的用法和各種時態的特殊之處.

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