问题
选择题
Having lived in China for 8 years, Helen has a good ____________ of both English and Chinese.
A．ability
B．guidance
C．command
D．program
答案
答案：C
题目分析：考查名词和词组：A. ability能力，B. guidance 指导，C. command命令，掌握，have a good command of“精通”，D. program节目，课程，句意：在中国生活了8年，海伦精通英语和汉语。选C。