She ( ) to Pairs, hasn't she? (go)Yes.How ( ) she ( ) there? (go)She ( ) there by air. (go)
查看答案
So far, many countries ( ) their software programs. (develop)
Mr Chen ( ) up smoking last year. (give)
Mr. Chen ( ) up smoking since last year. (give)
We haven't seen each other ( ) a long time.(for, since)