题目内容

【题目】“C your mind on your textbook, Jack! You've wasted too much time daydreaming!” the teacher said angrily in class.

【答案】Concentrate
【解析】句意：专心于课本，杰克！你浪费了太多时间做白日梦。concentrate one's mind on固定短语，“专心于......”，可知答案为Concentrate。祈使句，注意大写开头。

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