Facing up to the globalization and information trend of economy,

Facing up to the globalization and information trend of economy, China's higher education needs to be reformed in order to ensure the competition ability of China's economy ______the 21st century.
A、at
B、of
C、in
D、on
【正确答案】：C
【题目解析】：表示时间时，in用于表示比一天或长或短的一段时间；on 用于指一天或具体某一天时间段；at可能是唯一用于表达非持续性含义的介词，说明时间点；at也可以表示日子，这种情况下，时间段仍被视为时间点。