I didn' t manage to do it you had explained how. A. until B. unless C. when D. b——青夏教育精英家教网—

摘要： I didn' t manage to do it you had explained how. A. until B. unless C. when D. before

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I didn' t manage to do it _____ you had explained how.

A. until B. unless C. when D. before

I didn’t manage to do it ______ you had explained how.

A. until　　　B. unless　　 C. when　　　　D. before

I didn’t manage to do it _____ you had explained how.

A. until 　 B. unless　 C. when 　 D. before

I didn’t manage to do it _____ you had explained how.

A. until 　　　B. unless　　 C. when 　　 D. before

I didn’t manage to do it_________ you had explained how.
A. unless B. until?
C. when D. since

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