After they _____ the first super computers in the 1940s, scientists and engineer

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问题 After they _____ the first super computers 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

解析考查动词时态。本句是主从复合句，主句使用了一般过去时(began)，其动作“开始开发”在after引导的时间状语从句的动作“创造第一台超级计算机”之后发生，且从句中有表示过去时间的状语in the1940s，因此需用一般过去时。B项created正确。

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