There was much singing, mostly of
I have served as a monitor 。I worked as a monitor before.I was the monitor of the class.
I have been xxx,xxx and xxx.I used to work for xx.xx.and xx
i used to be..i took charge of..i once served as..i was not only ..but also... , as well as...以上4个是不同的句型 每个都可以用的 后面加and就可以的 至于第一个 你曾经是**委员 意思和你曾经担任什么职务不是统一个意思嘛~我比较推荐最后一个句型 这样避免总是用and来连接 感觉你语法很好
I was the monitor of the class.
I have served as a monitor
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