— I don’t know whether I should go abroad or not Mum.— I leave to your own judgment whet

问题补充：

— I don’t know whether I should go abroad or not, Mum.

— I leave to your own judgment whether you should do it.

A. that

B. it

C. this

D. what

答案：

A. that

(答案→)B. it

C. this

D. what

解析：it指代这件事。