Jane never ------ ------ her sister in here letter. 补充填空。

   答案是referred to。

   refer to  

   1. 涉及，谈到，提到；关系到：

   He never referred to his sisters in his letters.

   他在信里从未提到过他的姊妹。

   2. 提交(某人或某机关考虑办理或决定)：

   They referred their plan to the management.

   他们将计划提交管理部门。

   3. 认为…起源于；认为…与…有关；有…归属于；归功(或咎)于；归于：

   Mr White referred his success to his hard work.

   怀特先生说他的成功是靠勤劳工作而获得的。

   4. 引证；查阅，参考：

   If you don't know the spelling of a word, you should refer to a dictionary.

   如果你不会拼写一个词，你应当查一下词典。

   5. 向(某人)查询；让…找…(处理)：

   For further details, I refer you to the advisory department.

   详细情况请与咨询处联系。