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Some people viewed the findings with caution, noting that a

时间:2021-11-30 13:01来源:未知作者:admin 点击: 次

8：Some people viewed the findings with caution, noting 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

8：Some people viewed the findings with caution, noting 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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Some people viewed the findings with caution, noting that a

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