单项选择题

Sarah （）the laundry when Nick stopped by to say hello

A. was doing
B. had done
C. does  
D. has done

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单项选择题
Cho-a has never （）outside of Seoul

A. live   
B. will live 
C. lived  
D. living
单项选择题
I （）reach Susan by phone. Do you know where she is

A. may not        
B. am not able to
C. had to         
D. used to
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