Thanks to the good care of the nurses ,the boy is recovering from his lung operation .A.

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A. quietly
B. actually
C. practically
(答案→)D. gradually
解析：      题意：多亏了护士们的悉心照顾，这个男孩逐渐从肺手术中恢复过来。quietly安静地； actually 实际上； practically实际上，事实上；gradually逐渐地。