It will be another 50 years ______ our country is expected to reach the level of a medium developed country.
A．sinceB．before
C．thatD．when
B
B 考察連詞。句義：五十年以后我國(guó)才有望達(dá)到中等發(fā)達(dá)國(guó)家的水平。It is+一段時(shí)間+before從句，過(guò)多久…才…；遵循主講從現(xiàn)的原則，B正確。Since引導(dǎo)時(shí)間狀語(yǔ)從句，從句用一般現(xiàn)在時(shí)，主句使用現(xiàn)在完成時(shí)。故B正確。
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