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题目
题型:专项题难度:来源:
Scientists say it may be five years _____ it is possible to test this medicine on human patients.[     ]
A. since
B. until
C. before
D. when
答案
C
核心考点
试题【Scientists say it may be five years _____ it is possible to test this medicine o】;主要考察你对连词等知识点的理解。[详细]
举一反三
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