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

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

选项 A、that
B、what
C、which
D、those

答案B

解析 分析句子结构可知,from后面是一个宾语从句,空处所填的引导词在从句中作表语。that引导宾语从句时,在从句中不作成分,故排除;which表示选择关系,不符合题意,也排除;what可以引导宾语从句,在从句中作主语、宾语和表语。故选B。
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