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    19、On February 11, a US satellite and a burnt-out Russian satellite ran into each other, ________ clouds of space debris （碎片） that could threaten nearby spacecraft.  

    A. created                      B. creating            C. to create             D. has created  

    19、B

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    On February 11, a US satellite and a burnt-out Russian satellite ran into each other, ________ clouds of space debris （碎片） that could threaten nearby spacecraft.  

    A. created                      B. creating            C. to create             D. has created  

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