It took him a long time to the skills he needed to become a professional artist.A. requir

问题补充：

It took him a long time to the skills he needed to become a professional artist.

A. require

B. acquire

C. inquire

D. gather

答案：

A. require

(答案→)B. acquire

C. inquire

D. gather

解析：这些选项的词形看似一样,但意思不同。require 需要,要求,命令；acquire 获得,学到；inquire 询问,问明,查究； gather 使聚集,搜集,积聚,推断。这里指获得技术。故选acquire。