D is going to be
There is going to be a sports meet next week
be going + 动词不定式
1.这种结构表示主体现在打算在最近或将来要做某事.这种打算往往是事先考虑好的.例如：I am going to see my grandmother tomorrow.明天我要去看望我奶奶.
2．这种结构还可以表示说话人根据已有的迹象认为非常可能即将发生某事.例如：
Look at these black clouds-it is going to rain.看这些乌云--要下雨了.
I think it is going to snow.我看要下雪.
这种结构有时也表示即将发生的情况.
I am going to be sixty-one next Tuesday.我下星期二就六十一岁了.
be going to 和will 在含义和用法上略有不同.be going to 往往表示事先经过考虑的打算；will多表示意愿、决心、有时不能互换.例如：I have bought some bricks and I am going to build a kitchen with them.我买了些砖,我要用它们盖个厨房.（不能用will替换