问题标题:
Isthisthefirsttimeyou____Beijing?A.havevisitedB.wouldvisitC.visitedD.havebeenvisitingNoonecanbesureifthecarondisplayfitshimorheruntilheorshe___themA.triesB.willtryC.triedD.havetried敢问选什么
问题描述:

Isthisthefirsttimeyou____Beijing?

A.havevisitedB.wouldvisitC.visitedD.havebeenvisiting

Noonecanbesureifthecarondisplayfitshimorheruntilheorshe___them

A.triesB.willtryC.triedD.havetried

敢问选什么

施伟回答:
  1Aitisthefirst,second,third,etc.time(that)sb.havedonesth.为一固定结构,that从句需用现在完成时.   2Auntil引导的从句中用一般现在时表将来.
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