And if you become rich ,you will have a difficult time knowing who your real friends are.这句话为什么用knowing,

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Andifyoubecomerich,youwillhaveadifficulttimeknowingwhoyourrealfriendsare.这句话为什么用knowing,Andifyoubeco

And if you become rich ,you will have a difficult time knowing who your real friends are.这句话为什么用knowing,
And if you become rich ,you will have a difficult time knowing who your real friends are.
这句话为什么用knowing,

And if you become rich ,you will have a difficult time knowing who your real friends are.这句话为什么用knowing,
have sth +doing 表主动语态 have sth done表被动语态