题目内容
(请给出正确答案)
[单选题]
新政策实施以来,这个城市发生了巨大的变化。()
A.Since the new policy carried out, great changes have taken place in this city.
B.Since the new policy was carried out, great changes have been taken place in this city.
C.Since the new policy carried out, great changes have been taken place in this city.
D.Since the new policy was carried out, great changes have taken place in this city. 参考
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