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It is been years _________ I enjoyed myself so much as last

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It is been years _________ I enjoyed myself so much as last night 这个为什么要用since 不用before?完全说不通啊.
________ the protective glasses when you begin the experiment .please
这个为什么要用wear?该用非谓语啊.
1.应该是It has been,这里是完成时,一般before不跟完成搭配,这是第一点,第二点呢,since是自从的意思
句子的意思是 自从我像上次晚上玩的那么开心之后就已经很多年了,before是在……之前,用在这里说不通
2.这里是祈使句,祈使句,动词放在句首要用原形
当你开始做实验的时候,请带上防护眼镜
再问： 确实是 It is been 这么一出就看不出来是完成时了。
再答： 原句是不是It's been years？？？？ 如果是的话就对了，It has 可以缩写成It's
再问： 原来如此 我还不知道这个。
It is been years _________ I enjoyed myself so much as last it is years since i enjoyed myself so much It has been many years since I enjoyed myself so much. it 's years ______ i enjoyed myself so much It's years (since) I enjoyed myself so much.Why? It's years when I enjoyed myself so much.翻译,并解释这里when的用法 It is years since I enjoy myself so much it's years since i enjoyed myself so much.中文意思是否为：我已经好多年没这么开 I enjoyed myself very much last night . Hi,Mary ,I enjoyed myself so much at your party last night ( It was years since I ___________ (enjoy) myself so much.填什么, last night was really happy,it's 2 years __i enjoyed myself