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【单选题】
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
举报
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三