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 本题为倒装句题。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.句意:他们试图与大使馆取得联系,但却是白费力气,故选C。
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