一Middle school students don’t know much about shopping online, _______ they?

   一 _______. It’s very popu]ar with teenagers.

   A.do；No      B.do; Yes      C.don’t; NO    D .don’t;  Yes

---Middle school students don’t know much about shopping online, ______ they?
---______. It’s very popu]ar with teenagers.

1. A.
   do；No
2. B.
   do; Yes
3. C.
   don’t; NO
4. D.
   don’t; Yes

一Middle school students don’t know much about shopping online, _______ they?
一 _______. It’s very popu]ar with teenagers.