2. 外语
  3. With the introduction of the electronic computer, there is no complicated problem ______ can be solved quickly.

With the introduction of the electronic computer, there is no complicated problem ______ can be solved quickly.

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问题 With the introduction of the electronic computer, there is no complicated problem ______ can be solved quickly.
选项 A、that
B、which
C、but
D、as
答案C
解析 ..but意为“仅仅，只有”。
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