In vain ______ to get in touch with the Embassy.

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问题 In vain ______ to get in touch with the Embassy.

选项 A、they tried
B、tried they
C、did they try
D、they have tried

答案C

解析句子结构辨析题。状语in vain置于句首时，句子中的主谓要部分倒装，即将谓语中的be动词或助动词提前，因此C 是正确答案。

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专业英语四级

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