题目内容：

I told him the __ reason that I thought he had a right to know what is going on.
I told him the ______ reason that I thought he had a right to know what’s going on. a. sole b. mere c. only d. unique

优质解答

答案是C.
这是一个惯用法,only reason
如：
But money is not the only reason.但工资也不是跳槽的唯一原因.
That's the only reason for feeling superior.那是我觉着优越的唯一原因了.
That's the only reason you started all this?那是你开始这的唯一原因?

追问：

答案给的A-sole 呀，我也认为选C-only

追答：

上边的例句都是词典里的标准例句。由此看那，标准答案有问题，或者说，这个题目出的不好甚至不对。你可以问老师这些词典里的列句为什么不对。