问题补充：
---John, why are you so upset?
---I­­­my cell phone all morning but it is nowhere to be found.A.am looking forB.have looked forC.have been looking forD.had looked for
答案：
C解析试题分析：考查时态，由后面的时间状语all morning可以知道动作一直在发生，所以是C，句子意思“整个早上我一直都在找我的手机，但是任何地方都找不到”
考点：考查时态
点评：时态是初中和高中阶段的重点和难点，是高考常考内容，时态的考查主要看时间状语，时间状语all morning很容易知道时态
即学即练：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 worseningB. have worsened
C.worsenedD. have been worsening
选D
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