【题目】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】C
【解析】a good command of English 精通英语，a must一个必备的东西（抽象名词具体化），该句意是：如果你想成功的做国际贸易，精通英语是必备的。选C。