once bad habits have been formed,it's very difficult to kick

once bad habits have been formed,it's very difficult to kick them
为什么是have been formed
once后面是加特定的时态吗
一定要填have been done吗

燕宇斌糖 1年前已收到1个回答举报

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seafowl0329 幼苗

共回答了18个问题采纳率：83.3% 举报

表示在kick之前,这个坏习惯已经形成,所以要一般用完成时

1年前

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你能帮帮他们吗

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