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    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
    C
    本题时间状语从句为一般过去时，主句的情况是在从句之前，是“过去的过去”，因此用过去完成时。
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