it is 8 o'clock when.不是强调句
强调句的句型是it be ...that
还有去掉it be...that ,句子还成立
我是coldinkaren希望可以帮到你,有不懂的还可以问我^^也就是it was about 500 years ago _____ the dream came true把it be... that 去掉，句子还成立？是的变成了about the 500years ago, the dream came true.是成立的