Is this the first time you ____Beijing?A.have visited B.would visit C.visited D.have been visiting No one can be sure if the car on display fits him or her until he or she ___themA.tries B.will try C.tried D.have tried 敢问选什么
问题描述：
Is this the first time you ____Beijing?
A.have visited B.would visit C.visited D.have been visiting
No one can be sure if the car on display fits him or her until he or she ___them
A.tries B.will try C.tried D.have tried
敢问选什么
答
A
This is the first time -----加完成时 固定句型
A
从句中用现在代替将来
答
A A
答
1 A it is the first,second,third,etc.time (that)sb. have done sth.为一固定结构,that 从句需用现在完成时.
2 A until 引导的从句中用一般现在时表将来.