◎ 题干
Since the world heritage list was first created in 1972, many more sites _____ it.
A. have added up to
B. are added to
C. have been added up to
D. will be added up to
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“Since the world heritage list was first created in 1972, many more sites _____it. [ ]A. have added up to B. are added to C. have been added up to D. will be…”主要考查了你对  【现在完成时的被动语态】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。