The children were made homework first.A. doB. to doC. didD. doing

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A. do
(答案→)B. to do
C. did
D. doing
解析：本题考查非谓语动词。在主动语态中，make sb do sth，表示使某人做某事，在被动语态中，省略的to，要加上，故选B。句意：孩子们被迫首先做家庭作业。