twice a week 和twice week 有神马区别?

twice a week 和twice week 有神马区别? once a week和twice a week Twice a week. Twice times a week. she exerction twice a week对twice a week twice weekly什么意思?和twice a week有什么不同? She exerise twice a week 对 twice 提问 My brother watches TV twice a week 对twice 提问 twice a week和 after school哪个前哪个后May paly softball _____________是twice a week after school还是after school twice a week为什么?但是答案是May paly softball twice a week after school once or twice a week 中文意思 goes,skating,she,a,twice,week造句 once or twice a week 造句 he watches tv twice a week中文 ( )do you go shopping?-------Twice a week. 用often.twice a week.but造句 用 twice orthree times a week. 提问 Twice a week的用法,急... ( )( ) do you ( ) the dishes?Twice a week