What made you so worried?(改为被动语态) _____ what ____ you made so worried?为什么?

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What made you so worried?(改为被动语态) _____ what ____ you made so worried?为什么?

What made you so worried?(改为被动语态) _____ what ____ you made so worried?为什么?
What made you so worried?(改为被动语态) _____ what ____ you made so worried?为什么?

What made you so worried?(改为被动语态) _____ what ____ you made so worried?为什么?
(By) what (were) you made so worried?
解析
一、主动调整为被动的步骤
1、原句宾语 you 改为主语;
2、原句主语 what 改为介词 by 的宾语,表示“由什么引起/被什么”;
3、原句主动语态的谓语动词 made 改为被动语态 were made.
二、变成被动语态后就形成了以下的结构:
you were made so worried by what?
三、把疑问代词调整到句首并按疑问句要求把表示被动的助动词 were 放在主语前:
What were you made so worried by?
四、把介词 by 放在 what 前,变成为口语形式的疑问句,就成了要求的填空题:
By what were you made so worried?