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He was ___ (suppose) to be here by nine.But he hasn't come y

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He was ___ (suppose) to be here by nine.But he hasn't come yet.
用所给单词的适当形式填空!
能否说明原因?
supposed.
原因:be supposed to 的用法
用法一: be supposed to... 其中to是动词不定式符号,不是介词,其后要跟动词原形.当be supposed
to... 的主语是“人” 时,意为“应该……
”;“被期望……”,它可以用来表示劝告、建议、义务、责任等,相当于情态动词should.如:
Everyone is supposed to wear a seat-belt in the car.
每个人在汽车里都应该系安全带.