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  3. Results of a recent study appear to explain the long-standing question of why many women develop lung cancer,( )they themselves

Results of a recent study appear to explain the long-standing question of why many women develop lung cancer,( )they themselves

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问题 Results of a recent study appear to explain the long-standing question of why many women develop lung cancer,( )they themselves are non-smokers.
选项 A、if
B、unless
C、but
D、although
答案D
解析
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