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【单选题】

It was when he began to make the new experiment in 1908 ______ such an ambitious plan.
A．had he

B．did he have
C．that did he have
D．that he had
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根据网考网移动考试中心的统计，该试题：

8%的考友选择了A选项

2%的考友选择了B选项

3%的考友选择了C选项

87%的考友选择了D选项

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