work harder than before,because i'm doing ___ i want to do.A.why B.that C.what.D.when

Mike decided ____(work) harder this year than last year. ( )fact bees and ants work harder than most animals. Americans work a lot harder than you do.句子最后为什么有个do?如题,为什么不直接说Americans work a lot harder than you.而要说Americans work a lot harder than you do. If you want to get a great s ,you must work harder than others. You can improve your English by ____ (work) harder than before the students in our class work much harder at english than __in their class.AthatBthese Cthose 这句话有没有问题!I work harder than he do. it's used to cry here.the best way is to work harder than I work harder than before ,because I'm doing () I want to do!whythatwhatwhen If you work harder than before,I'm sure you______better______(pay). he is work harder than me 句子有错吗,要be动词吗 how are you going to improve______this term?work harder than last tern. ...they pertended to work harder than ever.还有这里面ever 的用法. This work is very harder than that one找错He lives farer than any other student in your class找错 The _____ to be better than others drives him to work harder than before.A.uniqueness B.eagernes work hard play harder翻译? You will pass the examination if you work harder than before空格中用success的什么形式,为什么 He decides to work ____ than last year.A.haedlier B.more hardly C.much harder D.a little hard