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,

来源：学生作业帮助网 编辑：作业帮 时间：2024/11/15 15:53:38
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,
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