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we have experienced; they have have we experienced; have they did we experience; they did we had experienced; had they
did China change China has changed has China changed China had changed
Before have we never seen each other Never before we have seen each other Each other have we seen never before Never before have we seen each other
Before have we never seen each other Never before we have seen each other Each other have We seen never before Never before have we seen each other
have I heard I have heard did I hear I heard
did the city change the city has changed has the city changed the city changed
had lost have lost were losing lost
did we think have we thought we thought we have thought
so did we we didn't too so didn't we nor did we
we receive，not we have received，never did we receive，hardly had we received，certainly
did we think have we thought we thought we have thought
did we hear we heard had we heard we have heard
Never have I We never have Have we never Never we have
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