China's first Mars probe,Yinghuo1,was la
问题:
China's first Mars probe,Yinghuo1,was launched in the second half of the year 2011 and it was the
first time that China ________ another planet.[ ]
A.explored
B.researched
C.discovered
D.invented
China's first Mars probe,Yinghuo1,was launched in the second half of the year 2011 and it was the
first time that China ________ another planet.[ ]
A.explored
B.researched
C.discovered
D.invented