题目：
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
答案：
答案：C
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
