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Some people viewed the findings with caution, nothing that a

时间:2021-02-19 17:40来源:未知 作者:admin 点击:
(单选题)9: Some people viewed the findings with caution, nothing that a cause-and-effect relationship between passive smoking and cancer remains _____. A: to be shown B: to have shown C: to have been shown D: being shown
(单选题)9: Some people viewed the findings with caution, nothing that a cause-and-effect relationship between passive smoking and cancer remains _____.
A: to be shown
B: to have shown
C: to have been shown
D: being shown
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