You must work h＿＿＿ at English.

You must work h＿＿＿ at English. 同义句转换You must try your best to work hard at English. You must work hard( )English.A.on B.at C.A or B --Jack,you are weak in English.You must work har you must finish at ------[little]most part of the work We must work hard at English（一般疑问句） ———hard at You must work hard You must tell him to go out at once.句型转换,毎空一词You must tell h i must work hard on english.短文改错,为什么要把ON改成AT? (In order to master) English ,we must work hard at it为什么这样写? 翻译：if you come to our school,you must work hard.you do not h At work,I must work hard