Scientists say it may be five or six years _____ this medicine is tested on huma

游客2025-02-28 29

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://tihaiku.com/zcyy/3977181.html

相关试题推荐

随机试题

最新回复(0)

Ifyouwanttobecomeadoctor,yououghttostudy______.A、medicineB、themedici