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

試題分析：句意：他總是忙著做功課，以至于忘記吃晚飯。be busy doing sth忙于做某事，固定句型，故選C
點(diǎn)評：be busy doing sth="be" busy with sth 忙于做某事，初中英語對此類固定句型的題目考察較多，對于此類句型平時遇到了要加強(qiáng)積累并加強(qiáng)記憶。
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