In vain______to get the machine sold yesterday.A、he triedB、had he triedC、he ha

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问题 In vain______to get the machine sold yesterday.

选项 A、he tried
B、had he tried
C、he had tried
D、did he try

答案 D

解析倒装结构题。in vain意为“徒劳地；白费；无效”，表否定意义，放在句首要用部分倒装，此处就是把助动词提到主语前面，且时间副词是yesterday，故用一般过去时，所以did提到he之前，后面跟动词原形。故D为答案。

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