The employees were asked to concentrate their attention________improving the quality of the products

题目简介

The employees were asked to concentrate their attention________improving the quality of the products

题目详情

The employees were asked to concentrate their attention________improving the quality of the products.
[      ]
A. in  
B. to    
C. with  
D. on
题型:单选题难度:中档来源:同步题

答案

D

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