it's proving difficult___the men.1 for rescuing 2 to rescuing 3 to rescue 4 in rescuing选择哪一个,及分别说出每个为什么对与错,
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![it's proving difficult___the men.1 for rescuing 2 to rescuing 3 to rescue 4 in rescuing选择哪一个,及分别说出每个为什么对与错,](/uploads/image/z/14810427-27-7.jpg?t=it%27s+proving+difficult___the+men.1+for+rescuing+2+to+rescuing+3+to+rescue+4+in+rescuing%E9%80%89%E6%8B%A9%E5%93%AA%E4%B8%80%E4%B8%AA%2C%E5%8F%8A%E5%88%86%E5%88%AB%E8%AF%B4%E5%87%BA%E6%AF%8F%E4%B8%AA%E4%B8%BA%E4%BB%80%E4%B9%88%E5%AF%B9%E4%B8%8E%E9%94%99%2C)
it's proving difficult___the men.1 for rescuing 2 to rescuing 3 to rescue 4 in rescuing选择哪一个,及分别说出每个为什么对与错,
it's proving difficult___the men.1 for rescuing 2 to rescuing 3 to rescue 4 in rescuing
选择哪一个,及分别说出每个为什么对与错,
it's proving difficult___the men.1 for rescuing 2 to rescuing 3 to rescue 4 in rescuing选择哪一个,及分别说出每个为什么对与错,
3 to rescue 这是动词不定式 其他三项都是介词短语
it 是形式主语 只有动词不定式 能作真主语 其他三个选项 都不能作主语 故 错
如果选其他 三个选项 it 就指代不明