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It takes at least five to ten years ________it is possible to test this medicine on human patients.
It takes at least five to ten years ________it is possible to test this medicine on human patients.
admin
2016-08-11
30
问题
It takes at least five to ten years ________it is possible to test this medicine on human patients.
选项
A、before
B、since
C、after
D、when
答案
A
解析
本题考查时间状语从句。本句是before引导的时间状语从句的固定句型:it+谓语+some time+before sb.do(did)sth.,只有A项before放入句中符合。
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成人本科学位英语
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