前面的It是形式主语,实际主语是he is sent there at once
sent前面之所以有be,是由于被动语态的基本形式是be+动词过去分词,与前文的It不是一个概念的
之所以会疑问为什么有be,是混淆了开头的it的作用
be.it is necessary that he ____(be) sent there at once.分析；前面
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