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

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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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