答句时间前面不加at行吗? 比如A.Nine o'clock

Why not meet at nine o'clock?的同义句是什么?(- -at nine o'clock?)杠杠 School at nine o’clock when,start,you,did,riding,nine,at,o'clock,a,bike如何连词成句, My school stat at nine o clock 改否定句` Go to bed at nine o'clock.改为否定句 school begins at nine o'clock变否定句 Jack -------- at nine o'clock last Saturday evening.A slept Schooi _________(begin) at nine o'clock. their school [ ]at nine o'clock what____he____do at nine o'clock yesterday?(do) He goes to bed at nine o'clock 对 at nine o'clock提问 I begin work at nine o'clock和I begin to work at nine o'clock