2. 考研
  3. Some people viewed the findings with caution, noting that a cause-effect relationship between smoking and cancer remains ______.

Some people viewed the findings with caution, noting that a cause-effect relationship between smoking and cancer remains ______.

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问题 Some people viewed the findings with caution, noting that a cause-effect relationship between 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 结合选项的意思可以看出该题的大概意思，即：“有些人对这些结果持谨慎态度，认为吸烟与癌症的因果关系有待证实。”关系是被证实，属于被动，因此将主动的B先排除。有待证实是将来的事，动词的形式应是不定式，因此D也可以排除。A和C的区别在于时态，根据题意，显然A为正确答案。
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