问题描述：
英语语法倒装句疑问
The old couple have been married for 40 years and never once___
with each other.
答案是填”have they quarreled”．理由是”从 never once 所引导的句子结构来分析,应该用倒装形式”
那么所引导的句子结构是指什么结构?
The old couple have been married for 40 years and never once___
with each other.
答案是填”have they quarreled”．理由是”从 never once 所引导的句子结构来分析,应该用倒装形式”
那么所引导的句子结构是指什么结构?
问题解答：
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