A: Do you know when IOC put forward the issue of environmental protection?
A: Do you know when IOC put forward the issue of environmental protection?
你知道国际奥委会在哪一年提出环保课题的吗？
A: Do you know when IOC put forward the issue of environmental protection?
你知道国际奥委会在哪一年提出环保课题的吗？