题目内容
4.Hehas been (be) a volunteer in Ya-an,Sichuan since the earthquake happened.分析 自从地震发生以来,他就在四川雅安当志愿者.
解答 答案:has been.现在完成时表示从过去的某个时刻开始的动作一致持续到现在,并有可能持续下去.根据后面的时间状语"since the earthquake happened",可知当志愿者是从过去某时刻开始,一直延续到现在的动作,还有可能延续下去,所以要用现在完成时.现在完成时的构成为have/has+动词的过去分词;另外主语是he,结合be动词,所以要用has been.故填写has been.
点评 根据题目从句中的时间状语,然后再去确定主句的时态,最后确定所需要的答案.
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