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,所以可排除those。若用those,则此句应改为…from those in the past。
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