While Sergei Korolev ___ new rocket designs, the Soviet Union ___ to launch the first artificial satellite. was developing, was preparing developed, was preparing was developing, prepared had developed, prepared
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While Sergei Korolev ___ new rocket designs, the Soviet Union ___ to launch the first artificial satellite.

  • was developing, was preparing
  • developed, was preparing
  • was developing, prepared
  • had developed, prepared

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