work hard in还是work hard at?

work hard in还是work hard at? work hard in 还是work hard on we work hard还是hardly? 是work hard at sth.还是work hard on sth. learning is（ ） 填a hard work还是hard work 是they work all hard还是they all work hard do hard work还是do the hard work work work hard Work hard work hard 英语提问,紧急!是work hard ,还是work hardly? work hard at hard play hard-work hard how hard work 还是what hard work 我认为what hard word it is才对 work hard?work smart?翻译 a day's hard work 可以替换成one-day's hard work,对吗?还是one day hard work i remember that you work hard 还是worked hard,为什么? ______next time ,and you'll succeedworking hard 还是work hard.