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

分析 他們確信能讓自己的模型汽車不通電就跑起來.

解答 答案是it.考查it作形式賓語的用法.題干中it是形式賓語,真正的賓語是不定式短語to run without electricity.句意是:他們確信能讓自己的模型汽車不通電就跑起來.故答案是it.

點評 解答此類題目首先要掌握句意,然后根據(jù)語法填寫正確的答案.

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