单项选择题

I can't ______ what I am doing because it is so noisy here.

A．concentrate
B．concentrate in
C．concentrate on
D．concentrate about
<上一题 目录 下一题>
热门 试题

单项选择题
To her great ______ one of her former classmates got the first prize in the English Speech Contest.
A．astonish
B．astonishment
C．astonishing
D．astonished
单项选择题
The crops ______ by the dry weather, so the peasants of that area got much less income last year.
A．effected
B．were effected
C．affected
D．were affected
相关试题