题干
Obama paid a visit to China. He was warmly welcomed by Chinese people.
A：four days
B：four-day
C：four-days
D：four-days'
答案(点此获取答案解析）
B
Obama paid a visit to China. He was warmly welcomed by Chinese people.
A：four days
B：four-day
C：four-days
D：four-days'
