2. 外语
  3. I didn’t manage to do it______you had explained how.

I didn’t manage to do it______you had explained how.

admin2010-02-22  36
问题 I didn’t manage to do it______you had explained how.
选项 A、until
B、unless
C、when
D、before
答案A
解析
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专业英语四级

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