【題目】______ 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：隨著人口平均年齡的增長(zhǎng)，越來(lái)越多的老人要照顧。Unless除非；until直到；as因?yàn)�，正如，隨著；while雖然，然而，當(dāng)……時(shí)候。根據(jù)語(yǔ)境，故選C。

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