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专升本
It may be five to ten years______we can test this medicine on human patients.
It may be five to ten years______we can test this medicine on human patients.
admin
2017-03-09
55
问题
It may be five to ten years______we can test this medicine on human patients.
选项
A、since
B、after
C、before
D、when
答案
C
解析
since:自从;after:在……之后;before:在……之前;when:当……的时候。根据句意可知,选C。
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本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
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