31. If you want to do international trade successfully, ____

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31. If you want to do international trade successfully, ______ of English is _______.
A. good command; a must B. a good command; a need
C. a good command; a must D. good command; must
答案是什么
must 不是形容词么怎么要用 a must

C.a good command; a must
a good command of：对掌握熟练；精通
a must 必须的条件；不可缺少的东西
must也可作名词
n.[口语]必须做、看、听的事；必不可少的事

31. If you want to do international trade successfully, ____ what do you want to ____ about Why do you want to study International Business,签证时问道怎么回答 What will you want to do if you are free? You _____ do that,if you don't want to. If you want to stay,let me know,____ If you want to get more information,____ m If you want to have some cake,____ please If he doesn't want to do the job,does ____ want do? If do you want ,you Do you want to go to shopping ____ me? if you want to