确定一定以及肯定地告诉你：正确答案是第一个.
英文中表示某某世纪的时候,这个数字一律都是序数词,也就是说,一变成第一（one - first）,二变成第二（two - second）等等,THE一直固定与序数词搭配,放在词前.
在线等during__century,the world population has already reached 60 billion
在线等during__century,the world population has already reached 60 billion
填the twentieth 还是twentieth
填the twentieth 还是twentieth
其他人气：508 ℃时间：2020-01-31 18:12:33
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