Mary ______ all the housework, she dropped herself into the sofa, sighing with relief.

A．finished B．had finished C．having finished D．finishing

C

解析試題分析：分析句子可知，she dropped herself into the sofa是主句，后面是現(xiàn)在分詞短語作狀語，she前面是逗號，沒有連詞，故前面用獨(dú)立主格結(jié)構(gòu)的形式，Mary是邏輯主語。句意：瑪麗完成所有的作業(yè)后，她坐在沙發(fā)上，嘆了一口氣。
考點(diǎn)：考查獨(dú)立主格結(jié)構(gòu)。

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