He must finish his homework对括号部分提问!答得越好悬赏越多!

Who must finish his homework?
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再问： He must (finish his homework)对括号部分提问(括号忘记写了。。。。)
再答： What must he finish? 如果您认可我的答案，请点击下面的“选为满意回答”按钮，谢谢！
再答： 确定。must是使役动词，不需要用助动词do