The proportion of elderly people in the population is steadily growing______ they live lon

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The proportion of elderly people in the population is steadily growing______ they live longer; ______that fact brings them ever worsening problems.

A.while, so

B.when, but

C.as, whilst

D.whilst, just

请帮忙给出正确答案和分析,谢谢!

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  • 正确答案:C
    本题考查连词的用法,第一分句含有主句的时间状语从句,所以用as,意为"随着";第二分句是主句的让步状语从句,所以用whilst,意为"尽管,然而"。题意为,人口中老龄人的比例,随着他们的长寿持续稳定地增长,而那一事实带给他们的是越来越严重的问题。