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Before the first non-stop flight made in 1949, it ______ necessary for all plane
Before the first non-stop flight made in 1949, it ______ necessary for all plane
游客
2023-09-28
13
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问题
Before the first non-stop flight made in 1949, it ______ necessary for all planes to land for refueling.
选项
A、would be
B、has been
C、had been
D、would have been
答案
C
解析
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