A. | Unless | B. | Until | C. | As | D. | While |
分析 随着人口平均年龄的增长,越来越多的老人需要照顾.
解答 答案C.
A.unless,表示除非;B.until 表示直到…为止;D.while 当…时.
干扰项D项while 引导时间状语从句,表示"当…时",动词为延续性动词,表示持续的动作,强调状态.如,While I'm driving,I always listen to the radio.
as 引导的从句的动作和主句的动作通常是同时发生变化,有伴随的意味;而while没有这种意味.as引导时间状语从句,表示动作发生的背景和前提条件,且从句中的动作和主句中的动作是同时发生,从句的动词通常为延续性动词.根据本句句意,表示"随着",应为as.故选C.
点评 本题需要掌握as引导时间状语时的使用.
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