【题目】The machine might break down someday in the future, ____, you can dial this number for help.
A. in that case B. in what case
C. in which case D. in whose case
在线课程【答案】C
【解析】
试题 考查定语从句。句意：机器在将来某天坏了，在这种情况下，你可以打这个号码求助。先行词是上面这件事，所以定语从句用in which case。
考点 : 考查定语从句