UNTIL SHE REVISES
WE CAN NOT ALTERNATE THE TENSE USED BY THE AUTHOR ARBITRARILY. the real problem in this question is that using"revising "after "an editor" may confuse readers. so just change revising to she revises it or she has revised it, whatever
改成having revised;
没有完成时的话先后关系就不明显了，这种题很常见，不小心会错选E，要注意。
人物的混淆。
到底是editor，还是Helen。改成she revises，更为明确
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