it's proving difficult___the men.1 for rescuing 2 to rescuin

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,

孤之鸿雁 1年前已收到1个回答举报

rtyu 春芽

共回答了14个问题采纳率：92.9% 举报

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

1年前

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你能帮帮他们吗

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