问题
选择题
I didn’t manage to do it _____ you had explained how.
A．until
B．unless
C．when
D．before
答案
答案：A
not…until…结构。
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I didn’t manage to do it _____ you had explained how.
A．until
B．unless
C．when
D．before
答案：A
not…until…结构。