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、what
C、which
D、those
答案B
解析 本题考查的是宾语从句。只有B项what既引导宾语从句，又作从句的表语，故选项B为正确答案。A项that虽可引导宾语从句，但它只起引导作用，不在从句中充当什么成分。C项which不能独立引导宾语从句，必须和后面的名词一起引导。D项those可用来指代上文出现的同类名词，但题中代词they代指前文提到过的libraries，所以可捧除those。若用those，则此句应改为…from those in the past。
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