题目内容

He was so busy ____ his homework that he forgot to have supper.
A．to doB．doC．doingD．does
C

试题分析：句意：他总是忙着做功课，以至于忘记吃晚饭。be busy doing sth忙于做某事，固定句型，故选C
点评：be busy doing sth="be" busy with sth 忙于做某事，初中英语对此类固定句型的题目考察较多，对于此类句型平时遇到了要加强积累并加强记忆。
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