问题
                    
rld’s elderly population will exceed ____ of children by 2060, when each group____ to account for about one fifth of the population.
                            A:that ; isexpected
B:it; willexpect
C:that; expects
D:one ; will beexpected
                        
                        B:it; willexpect
C:that; expects
D:one ; will beexpected
正确答案是:
                        