With the introduction of the computer ,libraries today are quite different from _they werein the past.分析句子成分 为什么用what 而不用 which

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With the introduction of the computer ,libraries today are quite different from _they werein the past.分析句子成分 为什么用what 而不用 which
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With the introduction of the computer ,libraries today are quite different from _they werein the past.分析句子成分 为什么用what 而不用 which
With the introduction of the computer ,libraries today are quite different from _they were
in the past.分析句子成分 为什么用what 而不用 which

With the introduction of the computer ,libraries today are quite different from _they werein the past.分析句子成分 为什么用what 而不用 which
句子偏重于讲图书馆今时不同往日,比较的对象是以前的图书馆,所以用what指代之前的图书馆.which偏重于多选一,而这里不存在选择.
不理解就追问,理解了请采纳!