题文
（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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（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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