You shouldn't have the machines _____all the while; you ought to have them _____now and then.[

题目简介

You shouldn't have the machines _____all the while; you ought to have them _____now and then.[

题目详情

You shouldn't have the machines _____all the while; you ought to have them _____now and then.
[     ]
A run; repair                              
B. running; repairing  
C. run; repaired                       
D. running; repaired
题型:单选题难度:中档来源:河北省期末题

答案

D

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