We won’t forget the financial crisis and the troubles has caused to the people all over t

问题补充：

We won’t forget the financial crisis and the troubles has caused to the people all over the world．

A. which

B. this

C. what

D. it

答案：

(答案→)A. which

B. this

C. what

D. it

解析：考查定语从句。句中先行词为the financial crisis and the troubles，在从句中作主语，故用关系代词which，选A。