which lesson did you learn yesterday?A lesson seven B lesson seventh C the 7 lesson D 7lesson

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• which lesson did you learn yesterday?A lesson seven B lesson seventh C the 7 lesson D 7lesson
• 大哥大姐们,帮小弟看看下面几道题把Marie __________ the swimming lesson yesterday afternoon.选择一项：a.takes b.took c.taken d.take Doctors find a _______ between skin cancer and the length of time spent in the strong sunshine.选择一项：a.relative b.combination c.associative d.connection Look!The twins _____ new sweaters.选择一项：a.are worn b.wearing c.is wearing d.are wearing -When _______ you _________ the movie Titanic for the first time?-About 15 years ago.选择一项：a.have…seen b.did
• which lesson did you learn yesterday?A lesson seven B lesson seventh C the 7 lesson D 7lesson
• 在矩形ABCD中,对角线AC,BD交于点O,过顶点C作CE//BD交AB的延长线于E,且AC=CE.求证四边形ABCD是矩形.
• 在矩形ABCD中,过顶点C作对角线BD的垂线,与∠A的平分线相交于点E,试说明AC=CE.