英语：by around eight o'clock是否等于at about eight o'clock?

英语：by around eight o'clock是否等于at about eight o'clock? 10：Around at eight o'clock或者AT arond eight o'clock. Lucy .at eight o’clock. They must _____(be)at school by eight o'clock At about eight o'clock[根据答句写问句] My mother ________ work at about eight o'clock. class ______(begin)at eight o'clock. I b____ classes at eight o'clock. l b( ) classes at eight o`clock around的同义词At {around} eight o'clock ,Scott watches TV.此处,其同义 Our school starts at eight o'clock.对at eight o'clock提问 英语中时间前面是用什么介词,是：in eight o'clock 还是 at eight o'clock,