问题
选择题
increase of population is big problem of the country. [ ]
A．The; 不填
B．The; a
C．An; the
D．An; 不填
答案
答案：B
搜题请搜索小程序“爱下问搜题”
increase of population is big problem of the country. [ ]
A．The; 不填
B．The; a
C．An; the
D．An; 不填
答案：B