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On April 14, 2010, many people dressed in black with white flowers ______ their chests observed thr...
题目内容：
On April 14, 2010, many people dressed in black with white flowers ______ their chests observed three minutes of silence in memory of the victims in Yushu Earthquake .
A. pinned in B. pinned to C. being pinned in D. to be pinned to
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