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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 在過去的幾個月里,央行的主管和其他人一直呼吁采取措施阻止價格上漲太快.

解答 答案:C.根據時間狀語In the past few months可知謂語call for從過去一直到現在,所以用現在完成時,因此答案是C.

點評 考查現在完成時.現在完成時態(tài)的用法有:
1)強調動作是從過去持續(xù)到現在,并有可能繼續(xù)持續(xù)下去.
2)強調對現在的影響或結果,此用法容易和一般過去時混淆.兩者的區(qū)別是:一般過去時有動作發(fā)生的時間點,即過去某一時間發(fā)生某一動作;現在完成時則沒有,即不強調是哪個時間點發(fā)生的動作,而強調過去的動作對現在造成的影響和結果.
3)在過去不確定的時間里發(fā)生的動作,但是結果對現在有影響.

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