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China became the 143rd member of the WTO in 2001,thus(realiz

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China became the 143rd member of the WTO in 2001,thus(realizing)its 15-year wish .
如题,为什么不可以用having realized?晤,还有一个,Jose came to borrow my skiing boards yesterday,but it happened that I (lent )them out.为什么不用have lent?
ecame 与 realize两个动作是同时发生的,先后顺序不明显,故用realizing而不用having realized.
it happened 后的that从句通常用一般过去时,不用完成时.