why not start the meeting at once(原意不变,改变句子)

Let's start at once,or we'll be late for the meeting why were not you at the meeting last night?I why not（ ）a meeting at once?A、have B、to have C、having D、had 英语按要求改句子The leaves start falling down in autumn.(保持原意不变）The ( ) You not only ___ to go to the meeting at once,but also t -Why you were not present at the meeting yesterday?-I am sor she often has fun at parties改写句子,原意不变 We'll start at once if the rain has stopped. He is goimg to start work at once.The man said.将这个句子合并成含有宾语从 all of you are here why don'twe start at once As soon as Let the boy --------[not leave】at once. Why not hold the meeting in that room It ________