Diligence is it takes for the post-90's generation to win petitions.
A. what
B. where
C. which
D. when
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(答案→)A. what
B. where
C. which
D. when
解析：考查名词性从句。句义：勤奋是九零后要赢得竞争所需要的。根据后面从句中take后少宾语，所以排除B和D，因为where在从句中做地点状语，when做时间状语，which引导名词性从句是意为哪一个，意思不对，所以A正确