He must finish his homework before 9 o'clock.用finish his homework提问What__ he __ before 9 o'clock

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He must finish his homework before 9 o'clock.用finish his homework提问What__ he __ before 9 o'clock
He must finish his homework before 9 o'clock.用finish his homework提问What__ he __ before 9 o'clock

He must finish his homework before 9 o'clock.用finish his homework提问What__ he __ before 9 o'clock
what must he do before 9 o'clock?

What_must_ he _do_ before 9 o'clock?