题干
–– Beijing is a big city, isn't it?
–– Yes. In fact, it's one of ________ cities in the world.
A：big
B：bigger
C：biggest
D：the biggest
答案(点此获取答案解析）
D
–– Beijing is a big city, isn't it?
–– Yes. In fact, it's one of ________ cities in the world.
A：big
B：bigger
C：biggest
D：the biggest
