Question

Mr. Duncan raised an unnecessary question __________ he then failed to find an answer

1. A.
   to which
2. B.
   for which
3. C.
   with which
4. D.
   by which

Answer 1

A
试题分析：句意：邓肯先生提出了一个没有必要的问题，他后来也没有找到问题的答案。这里是定语从句，先行词是question，an answer to an unnecessary question问题的答案，这里需用介词to，which在这里作介词的宾语，故选A。
考点：考查定语从句的用法。