Quite well in the important exam he came back home and smiling.A. Having done; relaxedB.

问题补充：

Quite well in the important exam , he came back home,and smiling.

A. Having done; relaxed

B. having done ; relaxing

C. having been done ; relaxing

D. Done; relaxed

答案：

(答案→)A. Having done; relaxed

B. having done ; relaxing

C. having been done ; relaxing

D. Done; relaxed

解析：考查分词用法。第一空的done与句子主语he构成主动的关系，故使用现在分词的形式，且现在分词的动作发生在谓语动词之前，故使用完成式。第二空的relaxed是形容词对句子的主语进行的说明。句意：在重要的考试中做得很好，他回到了家，满脸微笑很放松。故A正确。