題目列表(包括答案和解析)
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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