Question

【题目】﹣Where is Tom？ ﹣He is busy______ his homework． He didn't finish it yesterday．

A. doingB. doesC. do

Answer 1

【答案】A

【解析】

句意：-Tom在哪里？-他忙着做他的家庭作业，他昨天没有做完。doing现在分词/动名词；does第三人称单数；do做，动词原形。这句话中使用了句型be busy doing sth正忙于做某事，故应选A。