摘要：34．--Where can we go into the trade center?--Haven’t you seen the sign over there?

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--Where can we go into the trade center?

--Haven’t you seen the sign ________ over there?

---Where can we go into to trade center?
---Haven't you seen the sign ______ over there.

---Where can we go into to trade center?---Haven't you seen the sign ______ over there.