---John, why are you so upset?
---I­­­      my cell phone all morning but it is nowhere to be found.
A．a(chǎn)m looking forB．have looked for
C．have been looking forD．had looked for
C

試題分析：考查時態(tài)，由后面的時間狀語all morning可以知道動作一直在發(fā)生，所以是C，句子意思“整個早上我一直都在找我的手機，但是任何地方都找不到”
點評：時態(tài)是初中和高中階段的重點和難點，是高考�？純�(nèi)容，時態(tài)的考查主要看時間狀語，時間狀語all morning很容易知道時態(tài)
即學即練：Traffic conditions in Beijing ________ for decades. At first people only complained about jams during rush hours，but today every hour is rush hour.
A. is worsening                        B. have worsened  
C.worsened                           D. have been worsening
選D
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