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题型：单选题 题类：常考题 难易度：普通
外研版2018-2019学年初中英语八下Module 7 Unit 3 Language in use习题二
—It's really hard to do so.
—Yes，it is.I can't ________ its meaning at all.
—Yes, He was sad when he knew his grade.
— Oh, really? I haven't my mailbox yet.
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