问题
单项选择题
Having finished lunch, the case was discussed.
A．they discussed the case
B．they had discussed the case
C．the case was discussed
D．the case had been discussed
答案
参考答案：A
解析： 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，表示动作学生在谓语动词表示的动作之前 所以选项A是答案。