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

游客2025-03-19 30

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。

转载请注明原文地址:http://tihaiku.com/zcyy/4004221.html

相关试题推荐

随机试题

最新回复(0)

Peopletodayspenda______portionoftheirtimeconferringontheproperwayto