问题
单项选择题
() people went to the concert which was held in People's Square () the night of May Day.
A. Thousands of; in
B. Thousand; on
C. Many thousand; in
D. Thousands of; on
答案
参考答案：D
解析：
本题考查数词和介词的用法。thousands of表示“成千上万的”；在具体某一天或具体某一天的上午、下午和晚上用介词on。故选D项。