His assistant is busy (correct) ______ papers.

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问题 His assistant is busy (correct) ______ papers.

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答案correcting

解析 be busy (in) doing sth.表示“忙于做某事”。另外一个短语:be busy with/at/over sth.,用于后面接名词的形式。例如:He is busy (in) doing his homework。或者可以说He is busy with/at/over his homework。
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