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It will be another 50 years ______ our country is expected to reach the level of a medium developed country.

Asince Bbefore

Cthat Dwhen

 

B

【解析】B 考察连词。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;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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