（题文）(2017·重庆B卷·27)Dave is a good boy and he always finishes ________ his homework on time. A. do B. ...
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题目内容：
（题文）(2017·重庆B卷·27)Dave is a good boy and he always finishes ________ his homework on time.
A. do B. did
C. does D. doing
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