【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：考查連詞。句義：五十年以后我國才有望達(dá)到中等發(fā)達(dá)國家的水平。It is+一段時間+before從句，過多久…才…；遵循主講從現(xiàn)的原則，B正確。Since引導(dǎo)時間狀語從句，從句用一般現(xiàn)在時，主句使用現(xiàn)在完成時。故B正確。

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