Tom used to be a lazy boy,he () while his classmates were studying.
A.were sleeping B.was sleeping
选B.
因为Tom 是【单数名词】
如果我帮到了你,
Tom used to be a lazy boy,he () while his classmates were studying.
A.were sleeping B.was sleeping
选B.
因为Tom 是【单数名词】
如果我帮到了你,