While ine worry is rather mon problem of the aged, loneliness is another problem that aged parents may face.
A. a; 不填
B. the; 不填
C. a; the
D. the; the
网友回答
(答案→)A. a; 不填
B. the; 不填
C. a; the
D. the; the
解析：考察冠词的用法。不定冠词和another才能对应，表示泛指，所以第一空不用冠词；parents复数表泛指，所以其前不用冠词。