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