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单选题
Before the first non-stop flight made in 1949, it _____ necessary for all planes to land for refueling.
A
would be
B
has been
C
had been
D
would have been
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参考解析
解析：
本句的时间状语为过去的某个时间点以前，所以要用过去完成时态。
本句的时间状语为过去的某个时间点以前，所以要用过去完成时态。
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