首页 > Although Fleming discovered Penicillin, it was over a decade ______ someone else turned it into the

Although Fleming discovered Penicillin, it was over a decade ______ someone else turned it into the

题目简介

Although Fleming discovered Penicillin, it was over a decade ______ someone else turned it into the

题目详情

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
题型：单选题难度：中档来源：不详

答案

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。

更多内容推荐

Copyright © 2018-2020 360优课网