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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Mark used to like his job but now he （）to change careers

A. wanted 
B. wanting
C. wants  
D. want
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The employees （）hard when the manager stopped by

A. had worked
B. were working
C. are working
D. have been working
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