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.
A more and more littering has occurred in orbits near Earth, often because
B orbits near Earth have become more and more littered, often from
C orbits near Earth became littered more and more, often resulting from
D there have been more and more littering of orbits near Earth, often because of E there had been littering more and more of orbits near Earth, often with
OA是B,D选项不太理解,看起来不太对劲但是说不出来哪里不对,除了because of用得不准确之外,其他的问题是什么呢?其次,littering在这里算名词吗?
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