Peter is a brilliant language leaner. Within two weeks, he has developed a good of Chinese and Japanese.
A. mitment
B. description
C. transformation
D. mand
网友回答
A. mitment
B. description
C. transformation
(答案→)D. mand
解析：考察名词辨析。Commitment 承诺，保证 description 描述 transformation 转换，变形 mand 命令，控制，指挥
A good mand of sth 意为对……很精通