4. The reports went missing in 2012 and nobody     them since.

A. sees      B. saw

C. has seen   D.  had seen

4.    C考查動詞的時態(tài)。句意：那些報告2012年就丟失了，從那以后沒有人見過它們。since在此處意為"從那以后"，這是現(xiàn)在完成時的標志。故選C。

題目來源：2015全品語法快練高中英語新課標 > 訓(xùn)練13 動詞的時（語）態(tài)和主謂一致

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