It is high time that they started setting off on a trip ,这句话

It is high time that they started setting off on a trip ,这句话 It is high time that they started out.他们该动身了.It is high time It is high time we forbade setting off fireworks.这句话什麽意思?谁能给 =英语作文 以It is high time we forbade setting off fireworks为题的英语 It is high time that they started out.他们该动身了.请问这是定语从句 强调句还是主 it is high time that . It is time(high time)that . 请问1．It is high time that we ＿．选started还是should have satrted? it is high time that...是什么从句? it is a pity that...是什么从句? it is high time that such a practice __to an end A.is that B it is high time that +should do 与it is high time that +did的区 it is high time that we placed great emphasis on this issue