2. 外语
  3. ______has been explored by 15 spacecraft? ______has a system of rings and more than 11 satellites?

______has been explored by 15 spacecraft? ______has a system of rings and more than 11 satellites?

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问题 ______has been explored by 15 spacecraft?
______has a system of rings and more than 11 satellites?
选项 A、 
B、 
C、 
答案A
解析
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