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8.I'm puzzled why he ______ back to me.He should have heard from me.(  )
A.hasn't writtenB.didn't write
C.doesn't writeD.hasn't been writing

分析 我不明白他为什么没给我回信,他早该收到我的来信了.

解答 答案:A
根据"He should have heard from me"可知,他已经收到我的来信了;因此这里应表示过去的动作(他收到我的来信)对现在造成的结果,即他还没给我回信;故应使用现在完成时;D.现在完成进行时;表示从过去某时间开始,一直延续到现在,并且还有可能持续下去的动作;而此处并不强调动作的持续性,故选A

点评 本题考查了现在完成时的用法.做本题时,首先应根据句意,判断空缺处的动作发生的时间以及所表达的意义;其次,应注意区分现在完成时与现在完成进行时的用法区别;因此,做类似的时态题时,需要熟练掌握各时态所表达的意义及用法.

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