Antioxidants were first cast into doubt-------(during/from/since)a major clinical trial in the US ,in -----(which/what/that)a very common antioxidant ,beta carotene ,-----(was/were/is/are)tested for ------(its/their/theirs)efficacy against lung cancer in high_risk subjects.-----(to/for/with)the surprise and concern of the scientists taking the supplement -----(intend,intended)to reduce the risk of cancer were --------(on/at/with)a significantly higher risk ------(for/of/to)developing lung cancer.
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during ,which,was,it's,to,intended,at,of
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During,which,was, its,to, intended,at,of...
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