With so much noise outside, the students can’t _____ their homework.A.concentrate onB.depend on C.keep onD.put their hands on
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A解析试题分析：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。考点：考查动词短语的意思。
点评：本题不难，理解了句意后不难得出