And if you become rich ,you will have a difficult time knowing who your real friends are.

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,
英语人气:172 ℃时间:2019-08-19 01:00:07
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have sth +doing 表主动语态 have sth done表被动语态
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