______fairly recently that this problem was solved, at least partially.

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问题 ______fairly recently that this problem was solved, at least partially.

选项 A、Until
B、Not until
C、It was until
D、It was not until

答案D

解析 本题是测试强调句,将含有not…until的一般陈述句变为强调时间状语的强调句时,需将否定词not与until一起提到强调结构中去。
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