是It have three...还是是It has three...请问这种句型里是用have还是has?

是It have three...还是是It has three...请问这种句型里是用have还是has? It's about three years since they＿here.是填came还是have been? i have three books.( )om my desk?是it is?还是they are on my desk? 下面选择题是选have had 还是have bought?I ( ) it since three years ago.A.had B.bought C.have had D.have bought It have a round face and three legs 哪错了?答对有积分!是have错了还是round错了还是legs错了 Have you bought it?--When( )you ( )it?如题：是用一般过去时还是现在完成时? 还有I have bought it.--When ( )you ( )it? He (when还have gone)to see his father three days ago. 为什么这样填啊? It is a long journey,about three hours,so we have to start early.我想知道we的后面是have to 还是must 是three-month还是 three-months对 是three girls还是the three girls 是what do you have for three meals a day 还是 what do you have for three meals one day Three of them (have)a book 是填has 还是have does a bird have wings 是it does 还是it has或it have 我去过那三次是I have been there three times还是I have been there for three times 有没有for?为什么? What's six ------three?---It's nine.横线部分是选and 还是or. Three years have/has passed.有谁给个明确的答案,到底是have 还是has 300 用英语说 是three hundred 还是three hundreds 是about three hundred还是about three hundreds 是not more than three还是no more than three