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【单选题】

The students __ the exercises, the teacher went on to explain the text.
A．doing

B．did
C．having done
D． to do
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根据网考网移动考试中心的统计，该试题：

16%的考友选择了A选项

0%的考友选择了B选项

78%的考友选择了C选项

6%的考友选择了D选项

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