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29.填空题:____ there were no innovations advocated on a national scale, China would never have such a significant influence in the world.A. IfB. OnlyC. UnlessD. Without

29.填空题:____ there were no innovations advocated on a national scale, China would never have such a significant influence in the world. A. If B. Only C. Unless D. Without

题目解答

答案

题目分析

我们需要在空白处填入一个合适的词,使句子语法正确且语义通顺。

原句:
______ there were no innovations advocated on a national scale, China would never have such a significant influence in the world.

句意理解:
后半句 China would never have such a significant influence in the world 意为“中国将永远不会在世界上有如此重要的影响力”。
前半句 there were no innovations advocated on a national scale 意为“没有在全国范围内提倡创新”。

结合语境,这里表达的是一个虚拟条件:如果没有在全国范围内提倡创新,中国就不会有如此重要的影响力。我们需要一个能引导条件状语从句的词。

选项逐一分析

  • A. If(如果)
    填入后句子为:If there were no innovations advocated on a national scale, China would never have such a significant influence in the world.
    语法上,If 引导的条件句使用 were,主句使用 would never have,符合虚拟语气的用法(表示与现在事实相反的假设)。
    语义上:“如果没有在全国范围内提倡创新,中国将永远不会在世界上有如此重要的影响力。” 逻辑完全通顺。

  • B. Only(仅仅,只有)
    Only 通常不单独引导条件状语从句。如果要表达“只有”,常用 Only if。单独使用 Only 放在句首,后面接完整句子,语法不通。

  • C. Unless(除非)
    Unless 意为“除非,如果不”,相当于 if... not...。
    填入后句子为:Unless there were no innovations... 即 If there were not no innovations...(双重否定),意思变成了“除非没有创新(即如果有创新)”,这与后半句“中国将永远不会……”在逻辑上是矛盾的。我们需要的是“如果没有创新,就不会有影响力”,而不是“除非没有创新,才不会……”。

  • D. Without(没有)
    Without 是介词,后面通常接名词或名词短语,不能直接接一个完整的句子(there were no innovations... 是一个完整的句子结构)。因此,这里不能用 Without。

结论

通过排除法:

  • B 语法不符。
  • C 逻辑双重否定导致语义矛盾。
  • D 词性不符(不能接从句)。
  • A 语法正确,语义连贯。

正确答案:A. If

解析

本题考查虚拟语气中条件状语从句的引导词。解题的关键在于理解句子的逻辑关系,判断每个选项引导条件状语从句时在语法和语义上是否合适。

  • A选项:“If”表示“如果”,可以引导条件状语从句。在虚拟语气中,当表示与现在事实相反的假设时,条件从句用一般过去时(be动词用were),主句用“would/could/should/might + 动词原形”。原句中“ If there were no innovations advocated on a national scale, China would never have such a significant influence in the world”,从句用“were”,主句用“would never have”,符合虚拟语气的用法,语义上“如果没有在全国范围内提倡创新,中国将永远不会在世界上有如此重要的影响力”逻辑通顺。
  • B选项:“Only”通常不单独引导条件状语从句,若要表达“只有”的意思,常用“Only if”。单独使用“Only”放在句首接完整句子,不符合语法规则。
  • C选项:“Unless”意为“除非,如果不”,相当于“if... not...”。若填入“Unless”,句子“Unless there were no innovations...”就变成了双重否定,意思是“除非没有创新(即如果有创新)”,这与后半句“中国将永远不会……”在逻辑上矛盾,不符合句子想要表达的“如果没有创新,就不会有影响力”的逻辑。
  • D选项:“Without”是介词,后面通常接名词或名词短语,不能直接接一个完整的句子,而“there were no innovations...”是一个完整的句子结构,所以不能用“Without”。

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