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Scientists say it may be five or ten years ______ it is possible to test this me
Scientists say it may be five or ten years ______ it is possible to test this me
游客
2023-11-13
14
管理
问题
Scientists say it may be five or ten years ______ it is possible to test this medicine on human patients.
选项
A、since
B、when
C、after
D、before
答案
D
解析
before作从属连词,引导状语从句,意为“到……之前”,如:It was some time before I realized the truth.过了很长一段时间我才了解到真相。
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