都是逗号惹的祸

请看下面一题：

Dorothy was always speaking highly of her role in the play, _________, of course, made the others unhappy.

A. who                    B. which                     C. this                       D. what

许多学生认为此题句子结构比较混乱，逗号太多，难于理清头绪。请同学们先看下面一句：Dorothy was always speaking highly of her role in the play, _________ made the others unhappy. 一般同学都知道此题应填关系代词 which，用以引导一个非限制性的定语从句。事实上，上面一题就是根据此题演变出来，只不过在 which 与 made 之间插入了一个 of course。所以上面一题应选B。又如：

(1) The meeting was put off, _________, of course, was exactly what we wanted.

A. who                    B. which                      C. this                      D. what

(2) He was very fond of speaking French, _________, indeed, he spoke well.

A. who                    B. which                      C. this                      D. what

以上两题答案均选B，which 引导的为非限制性定语从句，其后的 of course 和 indeed 为插入成分。(from www.nmet168.com)