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 |
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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 |
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