题目内容

17．They are sure that they can makeit possible for their model cars to run without electricity．

分析 他们确信能让自己的模型汽车不通电就跑起来．

解答 答案是it．考查it作形式宾语的用法．题干中it是形式宾语，真正的宾语是不定式短语to run without electricity．句意是：他们确信能让自己的模型汽车不通电就跑起来．故答案是it．

点评 解答此类题目首先要掌握句意，然后根据语法填写正确的答案．

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