It' s a pity that there are many teenagers _____only on-line activity is chatting with their e -pals...
2022-12-01 12:42:43 115次 2015届山东省济宁市高二上学期期中检测英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
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
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