With so much noise outside, the students can’t their homework.A. concentrate onB. depend

网友回答

(答案→)A. concentrate on
B. depend on
C. keep on
D. put their hands on
解析：重点理解句意，掌握四个选项的区别concentrate on集中精力于某事 depend on依靠 keep on 继续put their hands on找到；把手放到什么上面  整个句意为：伴随着外面巨大的噪音，学生们不能集中精力于他们的功课上。故选A。