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题型：单选题 题类：常考题 难易度：普通
人教新目标版九年级Unit6 When was it invented? Section B同步练习
— Thank you! It last year.
—Sure, it _______ in 1970 to tell us to protect our earth.
—No，I ．
—Sorry, Mum. It ____. I felt very tired after playing soccer.
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