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What did you say( )(change)his mind just now?这里为什么填to change

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What did you say( )(change)his mind just now?这里为什么填to change
What did you say中的did you say又是做什么成分,还有 until before主句中要是有not 一定会用nutil吗(最好例句) 我们明天期末考试了,
What did you say( )(change)his mind just now?这里为什么填to change
to change是不定式作目的状语.

did you say中的you是主语,did...say 是谓动.

句意: 你刚才说了什么使他改变了主意?

until, before主句中要是有not 一定会用until吗? 一般情况是这样,但不是绝对的.

如: He didn't go to bed until his mother came back .

直到妈妈回来他才上床睡觉.

You can't continue the training until you have recovered from your cold .

直到你的感冒恢复了, 你才能继续训练.

You can't leave before 5 o'clock this afternoon .