【单选题】

John had been working hard ______.

A、so his brother did
B、and so was his brother
C、so did his brother
D、and so had his brother

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根据网考网移动考试中心的统计，该试题：

9%的考友选择了A选项

34%的考友选择了B选项

1%的考友选择了C选项

56%的考友选择了D选项