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：五十年以后我國才有望達到中等發(fā)達國家的水平。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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