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20.In the past few months,the central bank governor and others ______ measures to prevent prices from rising too fast.(  )
A.called forB.are calling forC.have called forD.will call for

分析 在过去的几个月里,央行的主管和其他人一直呼吁采取措施阻止价格上涨太快.

解答 答案:C.根据时间状语In the past few months可知谓语call for从过去一直到现在,所以用现在完成时,因此答案是C.

点评 考查现在完成时.现在完成时态的用法有:
1)强调动作是从过去持续到现在,并有可能继续持续下去.
2)强调对现在的影响或结果,此用法容易和一般过去时混淆.两者的区别是:一般过去时有动作发生的时间点,即过去某一时间发生某一动作;现在完成时则没有,即不强调是哪个时间点发生的动作,而强调过去的动作对现在造成的影响和结果.
3)在过去不确定的时间里发生的动作,但是结果对现在有影响.

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