Marywasalwayssinginghighpraiseofherroleintheoffice，

问题详情：

Mary was always singing high praise of her role in the office，________ of course，made the others unhappy.

A．who       B．which   

C．this     D．what

【回答】

 B　which引导非限制*定语从句，指整个主句所述内容。

知识点：定语从句

题型：选择题