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

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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,

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 .

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