________the Internet is an important part of our daily life, about 3.9 billion people are still not online.

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问题 ________the Internet is an important part of our daily life, about 3.9 billion people are still not online.

选项 A、If
B、Because
C、Unless
D、Although

答案D

解析 本题考查让步状语从句的引导词。根据句意,逗号前的内容提到,互联网是我们日常生活的重要组成部分,但逗号之后却说约有39亿人未上网,因此空格处需要填入表示转折、让步意义的连词。Although意为“虽然,尽管”,可引导让步状语从句,不与but、however连用。因此本题答案为D项。If意为“假如,如果”,可引导条件状语从句。Because意为“因为”,可引导原因状语从句。Unless意为“除非”,可引导条件状语从句。这三个连词不能引导让步状语从句,因此均可以排除。
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