题目内容

In vain______to get the machine sold yesterday.

A. he tried
B. had he tried
C. he had tried
D. did he try

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Although______happened in this developed country sounds like science fiction, it could occur elsewhere in the world.

A. which
B. what
C. how
D. it

培养选拔优秀年轻干部是一件大事，关乎党的命运、国家的命运、人民的福祉，是()。

干部干事创业要树立正确的政绩观，有()的精神境界、功成必定有我的历史担当，发扬钉钉子精神、脚踏实地干。

公民是社会科学普及工作的主要社会力量。()