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

解析考查倒装句的用法。in vain表示否定的意思，类似地，no, little, hardly, seldom等置于句首时句子要部分倒装，即把助动词或情态动词放在主语之前。在此句中，主语为第三人称复数，时态为过去时，助动词应为did，故选C。

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