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Scientists say it may be five or six years _____ this medicine is tested on human beings.
Scientists say it may be five or six years _____ this medicine is tested on human beings.
admin
2019-07-18
49
问题
Scientists say it may be five or six years _____ this medicine is tested on human beings.
选项
A、since
B、before
C、after
D、when
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/3Y3O777K
0
成人本科学位英语
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