Some people viewed the findings with caution, noting that a cause-and-effect rel

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问题 Some people viewed the findings with caution, noting that a cause-and-effect relationship between passive smoking and cancer remained______.

选项 A、to be shown
B、to have been shown
C、to have shown
D、being shown

答案 A

解析语法题。句意是“一些人谨慎地看待这些发现，他们注意到被动吸烟和癌症之间的因果关系有待揭示”。remain to be done为惯用法，表示“有待于(被做)”。所以正确答案是A选项。

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Somepeopleviewedthefindingswithcaution,notingthatacause-and-effectrel