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—What were you doing     I knocked at the door?—I was sleeping.A. unless B. once C. when D. while

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A. What were you doing    What did you do   what you were doing    What are you doing  
at;doing   with;doing   at;to do   with;to do  
what you were doing    what you are doing    what were you doing    what are you doing  
what you were doing    what were you doing    what you are doing    what are you doing  
had you done; finished    were you doing; had just finished    did you do; had just finished    were you doing; was finishing  
What would you do  What did you do  What are you doing  What were you doing  
at; in doing  with; in doing   al; to do  with; to do  
had you done; finished    were you doing; had just finished    did you do; had just finished    were you doing; was finishing  
A. What were you doing    What did you do  what you were doing    What are you doing  
what were you doing    what did you do    what you were doing    what you are doing  
A. What were you doing    What did you do   what you were doing    What are you doing  
what were you doing    what are you doing   what you are doing    what you were doing  
had you done; finished    were you doing; had just finished    did you do; had just finished    were you doing; was finishing  
what you were doing    what were you doing    what you are doing    what are you doing  
what you were doing    what were you doing    what you are doing    what are you doing  
did; do  was; doing  were; doing  are; doing  
what you were doing  what were you doing   what you are doing  what are you doing  
are;doing  were;doing  did;do  can;do  
were ,doing, called    did, do, called    were, doing, was calling    did, do, was calling  
have you done; finished    were you doing; have finished    did you do; had just finished    were you doing; had just finished  

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