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1.We are sorry to hear no attention has been paid ____the qu

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1.We are sorry to hear no attention has been paid ____the qualities of their products since last year.A.to improving B.to improve C.for improving D.for improve
2.The mother is very patient with the children ____the father is very impatient.A.while B.however C.or D.when
3.She started to devote her energies to ____(teach)instead of performing.采纳最好的,最好有些分析.
A.to improving 
pay attention to 中的to 是介词,要接v-ing 作宾语
A.while
句子前后位对比关系,故用并列连词while“而”“然而”
teaching
       devote her energies to“致力于.” 中的to 是介词,要接v-ing 作宾语
 

再问: 太感谢了⊙▽⊙