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16.Be carefulnot to fall (not fall) off the ladder.

分析 当心不要从梯子上摔下来.

解答 答案:not to fall
根据关键词Be careful后接动词时,应该用固定用法be careful to do sth,意为小心翼翼(或仔细的)去做某事;根据括号里的提示词not fall,可知此句应该用其否定形式,带有动词不定式的否定形式为在to前面直接加not,变为be careful not to do sth,意为小心别…或避免去干某事.此处是指避免从梯子上摔下来.故填写not to fall.

点评 此题考查含有动词不定式的短语及其否定形式的变化.记住变化形式便容易作答.

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