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10.Some people viewed the findings with caution,noting that

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10.Some people viewed the findings with caution,noting that a cause-and-effect relationship...
Some people viewed the findings with caution,noting that a cause-and-effect relationship between passive somking and cancer remains____.
A.to have shown
B.to be shown
C.to have been shown
D.being shown
为什么选B,我基础不好,请讲详细点,分析考点及解题思路
10.Some people viewed the findings with caution,noting that
首先理通整个句子:有些人仍然对这个结果持有观望态度,因为还没有发现被动吸烟和癌症有直接因果关系的证据.
这里remains to be seen 对应的就是中文里“还没有发现”
还没有发现是以人为主语
而这个英文句子中那个“被动吸烟与癌症有直接因果关系”是主语,是“被发现、被显示”所以用被动语态 选B
所以做题时,最先要做的猜出句子想要表达的意思