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

问题补充：

With so much noise outside, the students can’t their homework.

A. concentrate on

B. depend on

C. keep on

D. put their hands on

答案：

(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。