答案选D.本题考查现在分词做状语.动词orbit和主语the satellite是主动关系,主动关系的话要选现在分词做状语,所以排除B和C；然后看A和D,A是完成式,只有在主句是过去时的时候,状语中的非谓语动词才要用分词的完成式.明白?非谓语动词包括哪些,可以承担哪些功能,你需要专题研究一下.继续努力!
While____the sun,the satellite has sent more than four billi
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