You must be work hard这样说可以吗

--Jack,you are weak in English.You must work har--Jack,you are weak in English.You must work hard.--I see.I believe I will （ ） learn English well soon.A.can B.could C.be able to D.have to You must be work hard这样说可以吗 You must be t__ after the hard work补充 after a long work ,you must be t（ ） People must be really t____to you for your work We must be strict_____ourselves_____our work. You must work hard这句话能说成You must working hard的吗?请指导,那说成You must be work hard可以吗？ har you finished是什么意思 you must succeed if you work hard 的同义句正确答案是：you must be successful if you work hard老师已经说了， You must be strong . you must be You must be hungry You must be joking You must be confident. You must be dreaming you must be careful When____the work,you must be careful.A do B are doing C to do D doing I think you must be busy at work,and your homework.Care for your health是什么意思.