Tiananmen Square is one of the largest public squares in the world and a famous landmark in Beijing, China. It's located in the heart of the city, just north of the Forbidden City. The square is named after the Tiananmen Gate (Gate of Heavenly Peace) that sits at its northern end.

Many people visit Tiananmen Square to see important national monuments such as the Monument to the People's Heroes, the Great Hall of the People, and Chairman Mao Zedong's Mausoleum. It has also been the site of many significant historical events in Chinese history.

If you've visited Tiananmen Square multiple times, it could be because you're interested in its historical significance, enjoy the architecture, or simply like spending time in this large public space. Please note that as with any major public site, there may be security checks and other regulations in place for visitors. If you have any specific questions about visiting Tiananmen Square, feel free to ask!

I often visited Tian an Men Square ________ I was staying in Beijing.

A until

B during

C while

D throughout

C 

解析

while引导时间状语从句，强调一段时间内正在发生的事，和进行时连用。