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

分析 那些報(bào)告于2012年丟失了，從那以后沒(méi)有人再見(jiàn)過(guò)它們．

解答 答案C．本題主要考查動(dòng)詞時(shí)態(tài)．句意強(qiáng)調(diào)過(guò)去報(bào)告的丟失對(duì)現(xiàn)在的影響和結(jié)果就是再也沒(méi)人看到過(guò)那些報(bào)告，故用現(xiàn)在完成時(shí)．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(shí)的標(biāo)志．故選C．

點(diǎn)評(píng) 時(shí)態(tài)題的考查關(guān)鍵是抓住句子的上下文含義和句中的時(shí)間狀語(yǔ)．要根據(jù)時(shí)間狀語(yǔ)來(lái)選擇合適的時(shí)態(tài)，在平時(shí)的學(xué)習(xí)中要注意積累有關(guān)時(shí)態(tài)的用法和各種時(shí)態(tài)的特殊之處．

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