lt's nine o'clock mike must ____（go）to bed.
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lt''snineo''clockmikemust____（go）tobed.lt''snineo''clockmikemust____（go）tobed.lt''snineo''clockmikemust___
lt's nine o'clock mike must ____（go）to bed.
lt's nine o'clock mike must ____（go）to bed.
lt's nine o'clock mike must ____（go）to bed.
must是情态动词,情态动词后加动词原形,所以填go
就填 go
goes,第三人称单数