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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: 句意：预计还要再过50年中国才能赶上中等发达国家的水平。固定句型：It will be +时间段 +before 从句，意思是“还要多久才能”，选B。

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