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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