It will be many years ______ the doctors and medical scientists can find _____ for cancer.
A．since; curesB．when; treatments
C．before; curesD．until; treaments
C
第一空考查連詞，since 自從，when 當(dāng)什么的時候，before 在什么之前，才，就，until直到，第二空考查短語：cures for cancer癌癥的治療方法，句意：許多年醫(yī)生們和醫(yī)療科學(xué)家才找到了癌癥的治療方法。所以選C。
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