2. 外语
  3. ______has been explored by 15 spacecraft? ______was thought by ancient people as two separate stars?

______has been explored by 15 spacecraft? ______was thought by ancient people as two separate stars?

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问题 ______has been explored by 15 spacecraft?
______was thought by ancient people as two separate stars?
选项 A、 
B、 
C、 
答案C
解析
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