问题补充:
Not having a good of English can be a serious barrier to achieving your goals.
A. demand
B. appreciation
C. command
D. experience
答案:
A. demand
B. appreciation
(答案→)C. command
D. experience
解析:
这题考查固定词组:having a good command of“精通”,句意是:不能精通英语可能是你取得成功的严重的障碍。选C。