At present, how we can look after old is becoming hot and severe issue.A. the, aB. a, th

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(答案→)A. the, a
B. a, the
C. a, a
D. the, the
解析：句意：现在如何照顾老人正成为一个热点的严重的问题。第一空填the，the old指“老年人”，第二空填a，泛指“一个热点的严重的问题”，所以选A。