问题补充:
单选题Youknowgreatchanges_____________inourschoolinthepasttenyears.A.have been taken placeB.took placeC.have taken placeD.were taken place
答案:
C解析C “发生”take place没有被动形式,排除A、D;in the past ten years提示用完成时,故选C。
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