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(gè)月里，央行的主管和其他人一直呼吁采取措施阻止價(jià)格上漲太快．

解答 答案：C．根據(jù)時(shí)間狀語In the past few months可知謂語call for從過去一直到現(xiàn)在，所以用現(xiàn)在完成時(shí)，因此答案是C．

點(diǎn)評(píng) 考查現(xiàn)在完成時(shí)．現(xiàn)在完成時(shí)態(tài)的用法有：
1）強(qiáng)調(diào)動(dòng)作是從過去持續(xù)到現(xiàn)在，并有可能繼續(xù)持續(xù)下去．
2）強(qiáng)調(diào)對(duì)現(xiàn)在的影響或結(jié)果，此用法容易和一般過去時(shí)混淆．兩者的區(qū)別是：一般過去時(shí)有動(dòng)作發(fā)生的時(shí)間點(diǎn)，即過去某一時(shí)間發(fā)生某一動(dòng)作；現(xiàn)在完成時(shí)則沒有，即不強(qiáng)調(diào)是哪個(gè)時(shí)間點(diǎn)發(fā)生的動(dòng)作，而強(qiáng)調(diào)過去的動(dòng)作對(duì)現(xiàn)在造成的影響和結(jié)果．
3）在過去不確定的時(shí)間里發(fā)生的動(dòng)作，但是結(jié)果對(duì)現(xiàn)在有影響．

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