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【題目】 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】

試題分析: 句意：預計還要再過50年中國才能趕上中等發(fā)達國家的水平。固定句型：It will be +時間段 +before 從句，意思是“還要多久才能”，選B。

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