A report says that the world population will pass six billion by the end of ----centuryA twentieth B twenty C the twentieth D the twentyth
问题描述：
A report says that the world population will pass six billion by the end of ----century
A twentieth B twenty C the twentieth D the twentyth
答
选c
a、序数词前须加the
b、此处需用序数词，固定的。
d、twentyth木有这种说法。。
答
C the twentieth