问题描述：
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
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
问题解答：
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