问题
选择题
Mary ______ all the housework, she dropped herself into the sofa, sighing with relief.
A．finished
B．had finished
C．having finished
D．finishing
答案
答案：C
题目分析：分析句子可知，she dropped herself into the sofa是主句，后面是现在分词短语作状语，she前面是逗号，没有连词，故前面用独立主格结构的形式，Mary是逻辑主语。句意：玛丽完成所有的作业后，她坐在沙发上，叹了一口气。