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题目
题型:不详难度:来源:
I didn’t manage to do it _____ you had explained how.
A.untilB.unlessC.whenD.before

答案
A
解析
not…until…结构。
核心考点
试题【 I didn’t manage to do it _____ you had explained how.A.untilB.unlessC.whenD.bef】;主要考察你对句式等知识点的理解。[详细]
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