问题描述：
Scientist say they have managed to find a cure for cancer.=
Scientist say they have ＿＿＿＿ ＿＿＿＿finding a cure for cancer.
Scientist say they have ＿＿＿＿ ＿＿＿＿finding a cure for cancer.
问题解答：
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