单选题：National libraries began to care about preserving the web wh

题目分类：专四
题目类型：单选题
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题目内容：

National libraries began to care about preserving the web when __________． A． Brewster Kahle urged them to do so
B． some materials needed to be preserved
C． the Internet Archive invited them to do it
D． a project to preserve information is under way

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答案解析：

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分类：专四题型：单选题

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分类：专四题型：单选题

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分类：专四题型：单选题