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一道英语选择题It has long been my custom_my visitors to some coffee

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一道英语选择题
It has long been my custom_my visitors to some coffee.
A.to treating B.treating C.treated D.to treat
我觉得这可以把它当作一个先行词为custom的定语从句所以选B但这又是个主语从句不定式作定语故选D.不知我哪个想法正确
一道英语选择题It has long been my custom_my visitors to some coffee
这就是一个一般的句子,It是形式主语,后面的不定式才是真正的逻辑主语,所以是D