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    【题目】 It’ll be another 50 years _________ China is expected to reach the level of a medium

    developed country.

    A. since B. before

    C. that D. when

    【答案】B

    【解析】

    试题分析：考查连词。句义：五十年以后我国才有望达到中等发达国家的水平。It is+一段时间+before从句，过多久…才…；遵循主讲从现的原则，B正确。Since引导时间状语从句，从句用一般现在时，主句使用现在完成时。故B正确。

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