2. 专升本
  3. After they_________the first supercomputer in the 1940s, scientists and engineers began to develop ways to create networks.

After they_________the first supercomputer in the 1940s, scientists and engineers began to develop ways to create networks.

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问题 After they_________the first supercomputer in the 1940s, scientists and engineers began to develop ways to create networks.
选项 A、create
B、created
C、have created
D、has created
答案B
解析 根据句意 和从句中的时间状语in the 1940s可知，从句应用一般过去时，表示在过去某个特定时间或某一段时间内发生的动作。故选B。
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