题目内容
9.Don't disturb the professor.He is busy ______ his lessons.( )A. | prepare | B. | prepares | C. | preparing | D. | to prepare |
分析 不要打扰教授,他正忙着备课.
解答 答案:C.根据He is busy ______ his lessons,可知本句考查了be busy doing sth忙于做某事,后面跟的是动词的ing形式.故选C.
点评 本题考查了非谓语动词的用法.解答时注意:be busy doing sth忙于做某事,后面跟的是动词的ing形式.
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