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下面空填什么The children were much more careful after I ____ them

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下面空填什么
The children were much more careful after I ____ them of the danger of fire.(warn)
答案给出的是warned,如果填had warned 对吗,过去完成时,在提醒危险以后,孩子们才小心的.是发生在小心以前,不应该是过去完成时吗,为什么要用过去时?
下面空填什么The children were much more careful after I ____ them
这里并不用特别强调是在某个动作发生前,不是强调这两个动作的先后的,不需要用过去完成时