Mary must keep her mind on her medical studies now, so it would be years ______ she could think about marriage.
A．beforeB．whenC．sinceD．until
A
考查連詞。Before 在什么之前，才，就，when 當什么的時候，since 自從，until 直到，句意：現(xiàn)在瑪麗把心思都放在醫(yī)學(xué)研究上，因此，再過幾年他才可能考慮結(jié)婚。故選A。
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