there are a lot of people on the beach at this time （填介词）year

there are a lot of people on the beach at this time （填介词）year
there are a lot of people on the beach at this time （填介词）year

there are a lot of people on the beach at this time （填介词）year
答案：of
每年的这个时候沙滩上有很多人.
加油!不明白再问!