His health is improving. I'm sure he will e back to work soon.
A. gradually
B. frequently
C. fluently
D. finally
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(答案→)A. gradually
B. frequently
C. fluently
D. finally
解析:考查副词:A. gradually逐渐地,B. frequently频繁地,C. fluently流利地,D. finally最后,句意:他的健康在逐渐改善,我肯定他很快就能来上班了。选A。