Having finished lunch, the case was discussed.

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问题 Having finished lunch, the case was discussed.

选项 A、they discussed the case
B、they had discussed the case
C、the case was discussed
D、the case had been discussed

答案A

解析 结构应用现在分词短语作状语时,其逻辑主语应与主语一致。分词逻辑主语是they,句子主语也应是they,所以选项C和D不对;而前半句用的是现在分词的完成式,表示动作发生在谓语动词表示的动作之前,所以选项A是答案。
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