we had a three-day vacation last week和he was the first pianist in the 70-year history of the exam1.为什么three-day和70-year 中间加了--2.of the exam 的of为什么用在这个地方,为什么不是for?

( )We had a ___ holiday last week.A.three-days B.three days C.three-day D.three day We had a __________ holiday last week.A.three days B.three-days C.three-day D.three day为什么用A不可以?和a five years old boy不是一样的么? we had a w___time in the moutains three days ago We usually have three m_____ a day.填什么 we usually have three meals a day 一般疑问句 We have three m_ a day - - 没想出来 We have three meals a day.(变否定句） 求教：We nhave had a little rain every day.I have been here in London for three days.We nhave had a little rain every day.请问：此句“We nhave had a little rain every day.”为什么用现在完成时?既然用了现在完成时,为什么 we have a _____ holidayA.three days B.three-days C.three day's D.three days' we'll have a()holiday.A.three days' B.three-day C.three-days D.A and B we usually have three meals a day就three划线提问 Yes,we can have a( )holidays A.three days B.three day C.three-day D.three-days 该选什么?为什么? We all had a very happy day.翻译 we had a good time that day.改一般疑问句 all we a had very day happy.乱词组句 We had a very happy Open Day改为否定句 we had a day off yesteray同义句转换 We finally had a day off from school this