Mary passed the driving test surprised everyone in the office.A. whichB. whatC. thisD. it

问题补充：

Mary passed the driving test, surprised everyone in the office.

A. which

B. what

C. this

D. it

答案：

(答案→)A. which

B. what

C. this

D. it

解析：考查非限制性定语从句中关系代词的辨析。which 指代前面的整个句子what 不用于定语从句；如果用C,D时前面必须用连词，否则就是定语从句。