He has been up to his chin in his research. The underlined part means ______.

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问题 He has been up to his chin in his research. The underlined part means ______.

选项 A、very tired
B、very efficient
C、very busy
D、very scared

答案C

解析 他为他的研究忙的焦头烂额。下划线部分的含义是——。注:短语up to one’s chin的意思是“非常忙碌”,这与C的意思一致。
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