I have warned you____ the danger,haven't I

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I have warned you____ the danger,haven't I
A to B about C at D of

D warn sb of sth提醒、警告某人某事
A项：warn sb. (not) to do sth. 提醒（警告）某人（不）做某事
B项：warn sb. about / against sb. / sth. 或 warn sb. against doing sth.
提醒某人／警告某人不要做某事.例：
He warned us about the serious situation.
他提醒我们形势的严峻.
They warned him against swimming in that river.
他们警告他不要到那个河里游泳.

I haven't done that have I? ----Have you tried the pizza b_____?----No,I haven't. Have you___been to Beijing?No,I haven't been the 造句：I have/haven’t .for. I haven't got还是I didn't have got I don't have..与I haven't ..的区别 I don't have it和 I haven't it. I haven’t got the reference book yet,but I’ll have a test on 根据首字母填词I haven't seen the film,but I have h______ it.People .---I haven’t got the reference book yet,but I’ll have a tes i haven't read both of his novels but from the one i have re I haven't been to the mountains