The students ____ homework has been finished are playing basketball on the playgroun.
A whose
B who
C which
D that
选项是A.
问题一：先行词是The students.这里的whose=the students'
问题二：怎么能知道这个是先行词?从homework 一词,我们可知是【学生的homework】.
问题三：that,which可以指代人吗?which不可以指代人.