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Before the first non-stop flight made in 1949, it necessary for all planes to la

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Before the first non-stop flight made in 1949, it necessary for all planes to la

11.Before the firstnon-stop flight made in 1949, it ________ necessary for all planes to land forrefueling.

A. would be  B. has been  C. had been  D.would have been

试题答案

答案：C

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