In America,only in a few cases does more than one household live under one roof.这里does是什么用法

In America,only in a few cases does more than one household live under one roof.这里does是什么用法

题目
In America,only in a few cases does more than one household live under one roof.这里does是什么用法
答案
倒装,介词词组放在句首要引起句子的半倒装,就是把助动词提前,原句本来应该是
more than one household lives under one roof only in a few cases
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