Scientistssayitmaybefiveorsixyears
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问题详情:
Scientists say it may be five or six years ____ it is possible to test his medicine on human patients.
A. since B. after C. before D. when
【回答】
C
知识点:动词
题型:选择题
问题详情:
Scientists say it may be five or six years ____ it is possible to test his medicine on human patients.
A. since B. after C. before D. when
【回答】
C
知识点:动词
题型:选择题