问题
选择题
It will be many years ______the doctors and medical scientists can find _____ for cancer. [ ]
A. since; cures
B. when; treatments
C. before; cures
D. until; treatments
答案
答案：C
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It will be many years ______the doctors and medical scientists can find _____ for cancer. [ ]
A. since; cures
B. when; treatments
C. before; cures
D. until; treatments
答案：C