答案:When I was (in)high school,my father retured and set up a food stand on the street.
很明显,这个句子中前面部分缺少一个介词in,介词短语in high school做表语.
答案:When I was (in)high school,my father retured and set up a food stand on the street.
很明显,这个句子中前面部分缺少一个介词in,介词短语in high school做表语.