题干
Which do you prefer to use to keep in touch with your friends, QQ WeChat?
A：and
B：but
C：or
D：SO
答案(点此获取答案解析）
C
Which do you prefer to use to keep in touch with your friends, QQ WeChat?
A：and
B：but
C：or
D：SO
、 
、 
各代表的数是几？ 