必修三以及必修四材料
6. Only after her mother came to help her for the first few months was she allowed to begin her project.
状语 以"only+___________"开头的句子要用 开头的句子要用 部分倒装语序 ___________________ ,即将____________________________放在主语 be动词,助动词或情态动词 放在主语 动词, 动词 之前. 之前.