A more practical way of keeping ideas secret would have been to write in a specially developed code（密碼）. ItIt is exactly what the expert is doing.
【考點】it指代上文提到事物、群體、想法．
【答案】It
【解答】
【點評】
聲明：本試題解析著作權屬菁優網所有，未經書面同意，不得復制發布。
發布：2024/5/27 14:0:0組卷：2引用：1難度：0.7
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