Getting to other planets or to the moon many problems.? A.involve B.involves C.i
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Getting to other planets or to the moon________many problems.?
A.involveB.involvesC.involvingD.to involve?
试题答案
答案:B

Getting to other planets or to the moon________many problems.?
A.involveB.involvesC.involvingD.to involve?
答案:B