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【单选题】

In vain ______ to get in touch with the Embassy.
A．they tried

B．tried they
C．did they try
D．they have tried
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根据网考网移动考试中心的统计，该试题：

29%的考友选择了A选项

7%的考友选择了B选项

62%的考友选择了C选项

2%的考友选择了D选项

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