英语单项选择题,在四个答案中选择正确答案,请详细说明理由.

题目

英语单项选择题,在四个答案中选择正确答案,请详细说明理由.
-There-----an interesting report in the hall this afternoon.
-Really?Who---it?
1 is going to be ,give
2 is going to have,ia going to give
3 is going to have,gives
4 is going to be,is going to give
非常抱歉，呵呵，我打错了字母，1的备选答案不是 is going to be ,give，而是 is going to be ,gives

答案

选4.this afternoon今天下午,可知事情将要发生在不久的将来,而且是按照计划进行的,必须会发生的,因此用be going to 结构.主语an interestiong report,who 都是第三人称单数,所以谓语be动词用单三is.某人作报告,做讲...