Students should by all means their studies though there are a lot of entertainments inviting them.
A. devote to
B. fix on
C. concentrate on
D. pay their attention
网友回答
A. devote to
B. fix on
(答案→)C. concentrate on
D. pay their attention
解析： concentrate on全神贯注于, 其他三个短语也有类似的意思, 但结构为: devote one’s life/ oneself…to (doing) sth专心致力于; fix one’s eyes/ attention on sth ; pay (much)attention to (doing ) sth