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12.I have some doubt that John will come on time.

分析 我怀疑John是否会按时到来.

解答 答案:that改成whether 
固定句型:have some doubt whether…"对…有疑问的";若用在否定句中则用that:have on doubt that…;故将that改成whether.

点评 解答该类题的时候,应注意观察该句子的语法结构和人称和数,再结合其具体用法将错误纠正.考生平时也应注意积累相应的知识.

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