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Bob could have seen the famous pop star ______ yesterday morning.
A.did he comeB.if he cameC.had he comeD.if he should come
C

试题分析:考查虚拟语气和倒装。在条件句中,表示与过去事实相反的虚拟语气时,条件句中使用过去完成时的时态。如果省略了if可以把had提前形成部分倒装的形式。本题的had he come yesterday morning="if" he had come yesterday morning。
点评:在条件句中,表示与过去事实相反的虚拟语气时,条件句中使用过去完成时的时态。如果省略了if可以把had提前形成部分倒装的形式。
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