31. If you want to do international trade successfully, ______ of English is _______.

题目

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

答案

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