定语从句题,The old man has two sons,both of _____ are college stu
定语从句题, The old man has two sons,both of _____ are college students. The old man has two sons,and both of _____ are college students. The old man has two sons,both of _____ college students.
The old man has two sons,both of who are college students. The old man has two sons,and both of they are college students. The old man has two sons,both of them college students.