－How is Emmy?

－I have no idea. She hasn’t written to me _________ we met last time.

A. since                 B. while                 C. as                     D. before

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科目：初中英語(yǔ) 來(lái)源：北京模擬題 題型：單選題

— How is Emmy?    
— I have no idea. She hasn't written to me ______ we met last time. 
[     ]
A. since
B. while
C. as
D. before

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