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指出下列句子中的错误l bought a new cd for two weeksmillie arrived at s

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指出下列句子中的错误
l bought a new cd for two weeks
millie arrived at school since 30 minutes ago
the poor dog has died yesterday
l bought a new cd two weeks ago.(bougut不是延续性动词,不能用for)
millie arrived at school 30 minutes ago(since和ago不能同用)
the poor dog died yesterday(去掉has)完成时必须是延续性动词