1樓：匿名使用者
had they been in ping xiang for 20 years?
原句是過去完成時，變為疑問句形式只需要把助動詞had置於句首即可。
2樓：小西西老師
had they been in pingxiang for 20 years?
他們在萍鄉呆了20年嗎？
肯定回答：yes, they had.
否定回答：no, they hadn't.
3樓：匿名使用者
改為一般疑問句，需要把had提前。had they been in pingxiang for 20 years？
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