They must _____(be)at school by eight o'clock

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Theymust_____(be)atschoolbyeighto''clockTheymust_____(be)atschoolbyeighto''clockTheymust_____(be)atsch

They must _____(be)at school by eight o'clock
They must _____(be)at school by eight o'clock

They must _____(be)at school by eight o'clock
就用BE
因为MUST后面要用动词原形

be