问题
选择题
Mr. Duncan raised an unnecessary question __________ he then failed to find an answer.
A．to which
B．for which
C．with which
D．by which
答案
答案：A
题目分析：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。