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Floyd, a 46-year-old black man, died hopelessly, ________ against the floor by a policeman for nine ...
题目内容：
Floyd, a 46-year-old black man, died hopelessly, ________ against the floor by a policeman for nine minutes, which gave rise to protests throughout the USA
A.having pinned B.to be pinning C.pinning D.having been pinned
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