both of my friends did not go abroad for advanced study 这句话是部分否定么

题目

both of my friends did not go abroad for advanced study 这句话是部分否定么

答案

是的.
both 的否定式：not…both (或：both… not) "并非两个……都……" 例如：
I don't want both the books. 我不是两本书都要.
Both (the) windows are not open. 两扇窗子并不都开着.