单项选择题

Jack （）so strong. He can lift the heavy boxes

A. was  
B. is   
C. be   
D. will be

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Sung-joon has been in the army （）two years

A. since  
B. ago  
C. once  
D. for
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Mr. Cheng （）tomorrow. Would you help me instead of him

A. didn't work      
B. wouldn't work
C. isn't working      
D. hasn't been working
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