Mary, ___ all the housework, dropped herself into the sofa, sighing with relief. A. finished B. had finished C. having finished D. finishing答案是Cdropped herself into the sofa是过去式啊,完成作业在这之前,为什么不选B

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Mary, ___ all the housework, dropped herself into the sofa, sighing with relief. A. finished B. had finished C. having finished D. finishing答案是Cdropped herself into the sofa是过去式啊,完成作业在这之前,为什么不选B
Mary, ___ all the housework, dropped herself into the sofa, sighing with relief.
A. finished B. had finished C. having finished D. finishing
答案是C
dropped herself into the sofa是过去式啊,完成作业在这之前,为什么不选B

Mary, ___ all the housework, dropped herself into the sofa, sighing with relief. A. finished B. had finished C. having finished D. finishing答案是Cdropped herself into the sofa是过去式啊,完成作业在这之前,为什么不选B
B是谓语动词的形式,只能充当谓语,如果选B的话,这个句子就出现两个谓语动词了.英语中除了并列动词作谓语外,其他情况下是不能在一个句子中出现两个谓语动词的.而并列成分之间是要加并列连词(如and,or,but)的.
这题如果选B,要在dropped前面加上and then；而且第一个逗号要去掉；另外,had finished中的had也要去掉,因为它与后一个并列谓语时态不统一.
如果选A,则应去掉第一个逗号,而且在第二个逗号后面要加上and then.
C项是一个非谓语动词,作状语.因为finish这个动作发生在dropped之前,所以要用它的完成式having finished而不用它的一般式finishing.

看我的分析：
Mary（主语）, having finished all the housework（分词短语做时间状语）, dropped （谓语）herself （宾语）into the sofa（地点状语）, sighing with relief（分词短语作伴随状语）

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亲：此题考查非谓语动词，主要是有了一个逗号，所以finished这个动作只能是伴随情况。整句话的谓语动词是dropped....
再如：Mike，having done his work, went out to play.
having done就能表示完成了。
你的理解应该这样：Mary had finished all the housework before she...

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选C，现在分词作状语
如果选B，则这是两个句子，必须有连词，像and

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