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题目
题型:不详难度:来源:
Scientists say it will be five or six years _____ it is possible to test this medicine on human patients.
A.beforeB.thatC.sinceD.when

答案
A
解析
此题考查时间状语从句的引导词。由It + be + 时间段 +before 从句“要过多久才…”可知,此处用before 。
核心考点
试题【Scientists say it will be five or six years _____ it is possible to test this me】;主要考察你对句法等知识点的理解。[详细]
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