While income worry is rather common problem of the aged,loneliness is another problem tha

While income worry is rather common problem of the aged,loneliness is another problem that aged parents may face.
A. a;/
B. the;/
C. a;the
D. the;the

A. a;/B. the;/C. a;theD. the;the解析：考查冠词的用法。第一空表示泛指的一个问题，因此用不定冠词a；名词复数表示一类人，前面不加冠词，因此第二空不用冠词。

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