it's (),so we must().A a hard work,work hard B work hard,har

it's (),so we must().A a hard work,work hard B work hard,har this is ____ ,so we must ____ on it.A.a hard work;hard work S( )comes from hard work ,so we must work hard. It ' s ----,we have to work hard .( ) A a hard work B , We must ( )(work)hard. it is a hard work还是it is hard work We all know__is the to__ A.work hard;success B.work hard;suc You must work hard It's hard work.work不可数吗? It is difficult to m() a language ,so you must work hard. We must work hard,or we'll( ) lt is a hard work,but we must finish it.改错