同学你好，该知识点来自沪江网校《新概念英语1、2、3、4册连读【限时特惠班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好~

如果想选because，从句就应该用一般过去时，表示老人的猫又被球踢到了，很生气，拿着球对踢球的少年说，You can't have this football back because you promised not to kick it at my cat again. 你不能把球拿回去了，因为你答应过我你不会再踢球踢到我的猫了。

同理，since也可以表示【因为】，跟because一样，没有选它同样因为，promised需要用一般过去时。

这道题选择了until是因为 not...until【直到....才...】的句型。
not… until 表达的意思是【直至某时才做某事】。动词为延续性或非延续性都可以。

否定句：
She didn't arrive until 6 o”clock.  她直到6点才到。
Don't get off the bus until it has stopped. 公共汽车停稳后再下车。
I didn't manage to do it until you had explained how. 直到你教我后，我才会做。

否定句可用另外两种句式表示。
(1) Not until …在句首，主句用倒装。
Not until the early years of the 19th century did man know what heat is.
直到19 世纪初，人类才知道热能是什么。
Not until I began to work did I realize how much time I had wasted.
直到我开始工作，我才认识到了我已蹉跎了几多岁月。

(2) It is not until… that…这是一个强调结构。
It is not until 8 o'clock that he didn't do homework
他直到8点才写作业

希望可以帮到你~祝你学习进步~