◎ 题干
It _____ Jack twenty minutes _____ the math problem yesterday.    
[     ]
A. took, to work out
B. takes, to work out
C. has taken, working out
D. is taking, working
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“It _____ Jack twenty minutes _____ the math problem yesterday. [ ]A. took, to work out B. takes, to work out C. has taken, working out D. is taking, working…”主要考查了你对  【实义动词】【不定式】【动词短语】【一般过去时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。