2019-2020学年度外研版必修一Unit 6 Period Two Integrating Skills & Cultural Corner课件(33张)
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5. adv.时常;经常 adj.经常的;频繁的 6. n.弊端;缺点 7. adj.平均的 8. vt.缩短 adj.短的

frequently

frequent

disadvantage

average

shorten

short