We all think ________ helpful for our study to have a break at the weekends.A.itB.thatC.thisD./
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A解析解析:本题谓语动词是think,空格后是形容词短语,而最后是不定式短语,help for our study指的是不定式短语to have a break at the weekends,因此这个不定式是动词think的宾语,故空格中应填一个形式主语;而选项中可以用作形式主语是it,因此A为正确