The 2018 Summer Olympics was held in London, UK. The city becomes the first in history to host the Olympic Games three
times.
The London 2018 Olympic mascots，which are named after two small English towns, are Wenlock and Mandeville. They only have one eye. But they look very friendly. Wenlock is wearing bracelets(手链）in the colors of the Olympic rings. UK children and families helped design the mascots.
On May 5, 2018, the Olympic Stadium opened in east London. Schoolchildren in London were the stars of the day. Niamh Clarke-Willis,a 9-year-old girl, pressed the button to open the Olympic Stadium with London 2018 Chairman Sebastian Coe. There were more than 40,000 people taking part in the ceremony. The stadium can hold 80,000 people，It hosted the Opening Ceremony of the London Olympics on July 27.
The tickets for the London 2018 Olympics went on sale on March 15，500 days before the Games began. There were 6. 6 million tickets to buy in six weeks. The cheapest cost is $ 20(210yuan) and the most expensive is $ 2,012(21,000yuan).
50. How many times has London held the Olympic Games?
A. Once.
B. Twice.
C. Three times.
D. Four times.