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

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?

那么地他叫个啥 1年前已收到2个回答举报

水中仙77 幼苗

共回答了20个问题采纳率：85% 举报

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,

1年前

戈壁滩上的大灰狼幼苗

共回答了77个问题举报

A
吸二手烟和癌症的因果关系有待揭示。

remain to be done 有待。。。

1年前

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