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.a(chǎn)s
A

試題分析:考查固定句式:It was/will be+一段時間+before…“要過多長時間就/才…”,句意:雖然弗萊明發(fā)現(xiàn)青霉素,但是10多年后其他人才把它變成20世紀偉大的藥物。選A。
點評:固定句型考的是平時學生的詞匯和短語的積累量,對常見的固定句型要了然于心,了解每個選項的含義是做好此類題型的關鍵,對于這類題,可從句意著手,同時,對于平時的學習要多進行積累詞匯,考試時才能很好的完成。
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