（2014年北京市西城区高三5月二模试题）21. — You look great! — I ______ out. Check out my muscles! A. will work B. was...
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题目内容：
（2014年北京市西城区高三5月二模试题）21. — You look great!
— I ______ out. Check out my muscles!
A. will work B. was working
C. have been working D. had been working
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