Some people viewed the findings with caution, noting that a cause relationship between passive smoking and cancer remains （）.-未来题库

Some people viewed the findings with caution, noting that a cause relationship between passive smoking and cancer remains （）.

未来题库→百科

Some people viewed the findings with caution, noting that a cause relationship between passive smoking and cancer remains （）.

A.to be shown

B.to have shown

C.to have been shown

D.being shown

正确答案： to be shown

Tags:relationship findings caution

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