It is in 1960 ______ Chinese first put out flag on Mount Qom

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It is in 1960 ______ Chinese first put out flag on Mount Qomolangma.
为什么是that 可不可以是定语从句用when

按照你的思路,
1.首先我假设填上when,句子就变成：
It is in 1960 when chinese first put out flag on Mount Qomolangma.
2.分析填上when的句子是否有语法或者语义错误：
when后的句子不是整个句子主干,可以直接忽略.
主语：it；系动词：is；好了,然后你发现表语就只能是in 1960了,但是这显然不符合语法（你可以说i'm at home,但不能说i am in 2013.）.
3.所以这里无法填上when.
4.考虑it is 和要填的词是一个固定搭配.假如填上that,就形成了it is that...的强调句：
It is in 1960 that chinese first put out flag on Mount Qomolangma.
5.检验填上that是否符合强调句的特征,就是删掉it is that后是否还是一个完整的句子：
in 1960 chinese first put out flag on Mount Qomolangma.
主语：chinese；谓语：put out；宾语：flag.句子主干没有语法错误.
因此应该填that而不是when.

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