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Although Fleming discovered Penicillin, it was over a decade ______ someone else turned it into the great drug of the 20th century.
A.beforeB.sinceC.whenD.as
A

试题分析:考查固定句式:It was/will be+一段时间+before…“要过多长时间就/才…”,句意:虽然弗莱明发现青霉素,但是10多年后其他人才把它变成20世纪伟大的药物。选A。
点评:固定句型考的是平时学生的词汇和短语的积累量,对常见的固定句型要了然于心,了解每个选项的含义是做好此类题型的关键,对于这类题,可从句意着手,同时,对于平时的学习要多进行积累词汇,考试时才能很好的完成。
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