Question

【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

Answer 1

【答案】C
【解析】句意：隨著人口平均年齡的增長，越來越多的老人要照顧。Unless除非；until直到；as因為，正如，隨著；while雖然，然而，當……時候。根據(jù)語境，故選C。