Since the start of the space age, more and more littering has occurred in orbits near Earth, often because the intentional discarding of lens caps, packing material, fuel tanks, and payload covers.
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Amore and more littering has occurred in orbits near Earth, often because
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Borbits near Earth have become more and more littered, often from
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Corbits near Earth became littered more and more, often resulting from
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Dthere have been more and more littering of orbits near Earth, often because of
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Ethere had been littering more and more of orbits near Earth, often with
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正确答案: B