【 高手进】一道英语小题Every student is s____ to be in his classroom at 9 a.m.

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【 高手进】一道英语小题
Every student is s____ to be in his classroom at 9 a.m.

supposed

Every student is s_upposed___ to be in his classroom at 9 a.m.
be supposed to do sth应该做某事