It was not until World War II two other scientists managed to use new chemical techniques to purify it. A. when B. that C. where D. before 题目和参考答案——青夏教育精英家教网—

题目内容

It was not until World War II ___ two other scientists managed to use new chemical techniques to purify it.

A. when B. that C. where D. before

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增加：在缺词处加一个漏词符号 (∧) , 并在此符号下面写出该加的词。

删除：把多余的词用斜线 ( \ ) 划掉。

修改：在错的词下划一横线, 并在该词下面写出修改后的词。

注意：1. 每处错误及其修改均仅限一词；

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