问题补充:
Not having a good of English can be a serious disadvantage to achieving your goals.
A. protection
B. appreciation
C. command
D. experience
答案:
A. protection
B. appreciation
(答案→)C. command
D. experience
解析:句意:没有掌握好英语,可能会成为实现你的目标途中的一个严重地劣势。have a good command of是固定用法,意思是精通,选C。