◎ 题干
The boys have _______ the stamps for two years.

A. been collected
B. collected
C. to collected
D. collecting
◎ 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“The boys have _______ the stamps for two years. [ ]A. been collected B. collected C. to collected D. collecting …”主要考查了你对  【实义动词的过去分词】【现在完成时】  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。