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  3. While______ the sun, the satellite has sent more than four billion bits of information back to earth.

While______ the sun, the satellite has sent more than four billion bits of information back to earth.

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问题 While______ the sun, the satellite has sent more than four billion bits of information back to earth.
选项 A、having orbited
B、being orbited
C、having been orbited
D、orbiting
答案D
解析 句意：“围绕着太阳运动的卫星已经传输回地球四十多亿条信息”。根据题干分析可知，空格处要用一个现代分词做伴随状语，使用分词主动形式。该分词由while引导，不能使用完成时。
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