to do是不定式,doing为现在分词,不定式表将来,现在分词表现在和经常性的动作,该句里面的text every morning是一个经常性的时间,所以用doing,要是改为next morning的话呢就是将来的某个时间那么就得用to do
It's useful_____English text every morning> A.for you to rea
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