It' s a pity that there are many teenage
问题:
It' s a pity that there are many teenagers _____only on-line activity is chatting with their e -pals !
A.who
B.that
C.which
D.whose
It' s a pity that there are many teenagers _____only on-line activity is chatting with their e -pals !
A.who
B.that
C.which
D.whose