The most important thing for Lucy is to find a proper job in which she can bring her abi

问题补充：

The most important thing for Lucy is to find a proper job, in which she can bring her ability and potential into full play．

A. this

B. that

C. one

D. the one

答案：

A. this

B. that

(答案→)C. one

D. the one

解析：

这题考查代词的用法，one指代前面的可数名词单数，这里是代指前面的a job，句意是：对露西来说最重要的事是找一个适当的工作，一个能够发挥她潜能的工作。选C。