the singer and dancer ___the party this evening空格里填 is to attend 但为什么不能用 is about to attend 有什么不一样?错在哪里?

问题描述:

the singer and dancer ___the party this evening
空格里填 is to attend 但为什么不能用 is about to attend 有什么不一样?错在哪里?

be to 表示将来时 = will
be about to正好,正要做某事...比如 I'm about to open the door when the phone ringing.我正要开门的时候电话响了