i'm telling you once a___ not to do that

i'm telling you once a___ not to do that
i'm telling you once a___ not to do that

i'm telling you once a___ not to do that
I am telling you once (again)not to do that.
once again表示“再一次、又一次”
“我再告诉你一遍,别那么做了!”
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again

again

time