Some people view the findings with caution, noting that a cause-and-effect relat

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

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

答案 A

解析 remain to be shown“尚待揭示”，不定式的一般式表示要实现的情况，其完成式表示已发生的情况。remain doing“保持……；一直……”，如：He remained standing for one hour．他一直站了一个小时。

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