For convenience it is common to speak of plants as "herbs," "shrubs," and "trees," but it is really no sharp distinctions among

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问题 For convenience it is common to speak of plants as "herbs," "shrubs," and "trees," but it is really no sharp distinctions among them.

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答案it-there

解析 译文:出于方便人们通常把植物说成草、灌木和树,但其实它们之间没有明显区别。
分析:考查there be句型。此处it并不代指句中任何成分,也不是形式主语,因为后文并无真正的主语部分,故it应改为there。
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