The more one is the English-speaking environment, the better he or she will learn the language.
A. exposed to
B. filled in
C. caught on
D. kept up
网友回答
(答案→)A. exposed to
B. filled in
C. caught on
D. kept up
解析：此题考查词义辨析。be exposed to”使某物/人暴露于……，使处于某种状态”，be filled in”使填充，补充”，be caught on “钩住，卡住”，keep up “维持，保持”。