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The birds _______ fly away last Saturday.     

A. let to        
B. is let to     
C. was let              
D. were let to
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科目:初中英语 来源:同步题 题型:单选题

The birds _______ fly away last Saturday.     
[     ]
A. let to        
B. is let to     
C. was let              
D. were let to

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