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Some people viewed the findings with caution, noting that a cause-and-effect rel
Some people viewed the findings with caution, noting that a cause-and-effect rel
游客
2024-09-16
1
管理
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
考查固定用法。remain to be done表示“有待于(被做)”,表示尚未做某事,故无需用被动语态的完成式,可排除B,选A。
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