【题目】It is _____ must to have a good ______ of a foreign language and a specific skill in such a competitive society.
A. /; view B. a; command C. a; order D. /; permit
在线课程【答案】B
【解析】
考查固定句型。句意：在这样一个竞争激烈的社会里，掌握一门外语和一门专门技能是必须的。It is a must to do sth.为固定句型，所以句中要用不定冠词。have a good command of…，为固定搭配，意为“精通……，……掌握的好”，故选B项。