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it has been decided ____they will leave for shanghai.填when还是

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it has been decided ____they will leave for shanghai.填when还是if
it has not been decided ____they will leave for shanghai.填when还是if
it has not been decided ____these foreign guests will visit our college.
it has been decided _when___they will leave for shanghai.
不可以用whether“是否”

it has not been decided __when__they will leave for shanghai
也可以用whether“是否”

it has not been decided __when__these foreign guests will visit our college
也可以用whether“是否”


这是主语从句, 不可以用if 引导
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再问: 你错了,第二句答案是if,不过我不知道为什么,请讲解,留个QQ号吧
再答: 问你! It 是不是形式主语? 如果是,那后面是不是主语从句? 主语从句能用if 引导吗?! 如果你还说我错了,那我无话可说了!!!!!
再问: 你真的错了
再答: 我手头的学生都不知道有多少了! 听你这话我哭笑不得 :)
再问: 加q:1587776788,我告诉你你错在哪,
再答: 这里说吧!
再问: college那题只能是if ,分析本句可知从句中不缺少成分,又需要是否的语义支持,故填if
再答: 你让我领教了什么叫“不进油盐”, 拿着错误的答案和解释当个宝! 这种情况我见过多少!!! it(形式主语) has not been decided(谓语) __whether__these foreign guests will visit our college(主语从句-真正主语---注意:if 不可以引导主语从句!!!!)