If you want to do international trade successfully of English is . A. good command; a mu

问题补充：

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：

A. good command; a must

B. a good command; a need

(答案→)C. a good command; a must

D. good command; must

解析：考查名词词组：a good command of English 精通英语，a must一个必备的东西，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。