◎ 题干
I'm wondering why Mr. Smith hasn't              _yet.    
[     ]
A. took on                    
B. turned on    
C. took up                    
D. turned up
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“I'm wondering why Mr. Smith hasn't_yet.[ ]A. took onB. turned onC. took upD. turned up…”主要考查了你对  【动词短语】  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。