2. 外语
  3. With the introduction of the computer, libraries today are quite different from ______ they were in the past.

With the introduction of the computer, libraries today are quite different from ______ they were in the past.

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问题 With the introduction of the computer, libraries today are quite different from ______ they were in the past.
选项 A、that
B、which
C、what
D、those
答案C
解析 名词性从句题。宾语从句可由连接词that引导，但that仅起连接作用，常可省略。若连接词在句中兼起一个句子成分的作用，应用what.分析本题句子结构发现，连接词在句中作表语，故选C项what。
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