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Only when I saw Tina sit in the dark alone did I realize she was unhappy.did为什么要放在 I 的前面?

题目详情
Only when I saw Tina sit in the dark alone did I realize she was unhappy.did为什么要放在 I 的前面?
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答案和解析
Only + 状语 位于句首时,句子要倒装:倒装的结构与一般疑问句一样:助动词+主+谓语动词
如:
Only in the way can you solve the problem.