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You s___learn fronm each other because you're good friends

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You s___learn fronm each other because you're good friends
横线上填什么?(开头s是提示)
7.____________thhere many books in the libiary?
A Is B Do C Are
should
再问: 什么意思?should
再答: “应当”,是情态动词。 问题补充选: C books可数的复数,用动词are