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【题目】______ the average age of the population increases, there are more and more old people to care for.
A.Unless
B.Until
C.As
D.While

【答案】C
【解析】句意:随着人口平均年龄的增长,越来越多的老人要照顾。Unless除非;until直到;as因为,正如,随着;while虽然,然而,当……时候。根据语境,故选C。

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