___________ had enough time,they would have visited the Grea

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___________ had enough time,they would have visited the Great Wall.A) Had they B) Have they C) Would they have D) If they

答案是A
这是虚拟语气的句子.Had they had enough time=== if they had had enough time --------这是对已经过去的事情的虚拟/ 假设.
== They didn't visit the Great Wall because they DIDN'T have enough time.
再问：时态前后一致吗？？可以用have they 吗？
再答： 1 have they ------不可以用，因为关注的是以前的事情。 2 时态前后必须一致：had had 搭配 would have visited

___ had enough time,they would have visited the Great Wall. They would have reached the nursery in time had it not been _Given.____ enough time and money,the researcher would have had they had time then,they would have studied English,too. They would have a rest if they time.A have Bhave ,had C woul they had just had enough time to swim out of danger when the this was the third time they()china.为什么括号中填had visited,this+ If I had had enough time,Iwould have done the work better.这句 The girls ( )(watch)a cartoon last night .They ( )(have)grea We would have finushed the work if we__(have)time.填had had.为英语 This is the place ___________ I have ever visited. if they had only had one more child, the fact would have pas