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
本題時(shí)間狀語(yǔ)從句為一般過(guò)去時(shí)，主句的情況是在從句之前，是“過(guò)去的過(guò)去”，因此用過(guò)去完成時(shí)。
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