Theyovercameallthedifficultiesandcompletedtheprojecttw...

问题详情：

 They overcame all the difficulties and completed the project two months ahead of time, ______ was something we had not expected.

      A. that                         B. which                      C. it                             D. what      

【回答】

B

知识点：定语从句

题型：选择题