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

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A. good mand; a must
B. a good mand; a need
(答案→)C. a good mand; a must
D. good mand; must
解析：考查名词词组：a good mand 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。