So many trees have been that the ground was covered with trees. A. cut away; falling B. cut off; fell C. cut up; falling D. cut down; fallen 查看更多

 

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So many trees have been ____ that the ground was covered with ____ trees.    
[     ]
A. cut away; falling    
B. cut off; fell    
C. cut up; falling      
D. cut down; fallen

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