However they dont envision obtaining soil samples from Mars until_____to try to ascertain
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However, they dont envision obtaining soil samples from Mars until_____to try to ascertain whether there is water on the most Earth-like planet in our solar system and, possibly, life.
A.2001
B.2007
C.2011
D.2017
请帮忙给出正确答案和分析,谢谢!
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