In vain ______ to get in touch with the Embassy.A、they triedB、tried theyC、did

游客2023-11-21 47

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 in vain句首倒装，是半倒装，正确答案是C。

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