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Whenyoubecomerich,youwillhaveadifficulttimewhoyourrealfriendsare.答案是knowing.为什么?

题目详情
When you become rich,you will have a difficult time ___ who your real friends are.
答案是knowing.为什么?
▼优质解答
答案和解析
have a difficult time doing sth 做某事有困难