题型：单选题题类：常考题难易度：容易

人教新目标(Go for it)版2019-2020学年八年级上学期英语期末模拟卷三

—Only 30 percent of the e-books online _______ good for children' s study and growth.

—So let' s be careful of reading online.

A、is B、are C、were

举一反三

—So let's be careful of reading online.

— Yes, they are.

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