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It was long supposed _____ the main difference between animals and plants was that animals could move about.A. thisB. thatC. whichD. because

It was long supposed _____ the main difference between animals and plants was that animals could move about. A. this B. that C. which D. because

题目解答

答案

我们来分析这道题目: 题目是: > It was long supposed _____ the main difference between animals and plants was that animals could move about. 选项是: A. this B. that C. which D. because --- ### 第一步:理解句子结构 句子主干是: > It was long supposed ___ the main difference... 这是一个典型的 **形式主语句型**,其中 **"It"** 是形式主语,**"was supposed"** 是谓语,**"that..."** 引导的是一个 **宾语从句**,说明“被假设的内容”。 所以这个句子的结构是: > It was supposed [that...]. --- ### 第二步:分析选项 我们要选择一个引导宾语从句的连词。 - **A. this**:this 是代词,不能引导从句,排除。 - **B. that**:that 可以引导宾语从句,表示“被假设的是……”,符合语法和句意。 - **C. which**:which 通常引导定语从句或名词性从句(如主语从句、宾语从句),但需要有先行词,这里没有,排除。 - **D. because**:because 引导原因状语从句,不符合句意和语法结构,排除。 --- ### 第三步:确定答案 正确答案是: > **B. that** 完整句子为: > It was long supposed **that** the main difference between animals and plants was that animals could move about. 意思是: > 长期以来人们认为,动物和植物的主要区别在于动物可以移动。 --- ### ✅ 最终答案: $$ \boxed{B} $$

解析

本题考查宾语从句的引导词。句子结构为形式主语句型,关键点在于识别that在宾语从句中的引导作用。that在此处不担任句子成分,仅起连接作用,且不可省略。

句子结构分析

原句为形式主语句型:
It was long supposed [that...]
其中:

  • It 是形式主语,真正的主语是后面的宾语从句。
  • supposed 后需接宾语从句,说明“被假设的内容”。

选项分析

  1. A. this
    • 错误原因:this 是代词,不能引导从句。
  2. B. that
    • 正确性:that 可引导宾语从句,表示“被假设的内容”。
    • 语法作用:连接主句与从句,不作成分,不可省略。
  3. C. which
    • 错误原因:which 引导名词性从句时需有先行词,此处无先行词。
  4. D. because
    • 错误原因:because 引导原因状语从句,与句意不符。

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