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Some people viewed the findings with caution,noting that a c

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Some people viewed the findings with caution,noting that a cause-and-effect relationship between passive smoking and cancer remains ___________.
一碰到这种题目我就不知道思路在哪?
A. 因为吸二手烟和癌症之间的因果联系还没有显示出来,所以是to be shown,
b选项都已经证实了,何必还要不定式to了?不选C的原因和不选b一样,