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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:初中英語 來源:同步題 題型:單選題

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

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