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Before the first nonstop flight made in 1949, it necessary for all planes to lan

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Before the first nonstop flight made in 1949, it necessary for all planes to lan

Before the first nonstop flight made in 1949, it_____ necessary for all planes to land for refueling.

A．would beB．has beenC．had beenD．would have been

试题答案

C

解析试题

标签：itinallfornecessary

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