问题补充：
people went to the concert that was held in Jinyun Square the night of April 25.
A. Thousands of; in
B. Two thousands; on
C. Thousands of; on
D. Many thousand; in
答案：
A. Thousands of; in
B. Two thousands; on
(答案→)C. Thousands of; on
D. Many thousand; in
解析：表示具体的数量数词不可以使用复数，故不选B，数词复数+of+名词，表示不确定的数量，在时间天前用介词on，本题中有个25号，故本题选C。
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