2. 外语
  3. Scientists say it may be five or ten years______it is possible to test this medicine on human patients.

Scientists say it may be five or ten years______it is possible to test this medicine on human patients.

admin2013-12-08  64
问题 Scientists say it may be five or ten years______it is possible to test this medicine on human patients.
选项 A、since
B、before
C、after
D、when
答案B
解析 本题为习惯性用法题。英语中表示“花多长时间才发生某事”时，常用“it is／was…before”这一结构，即“在……以前花了多少时间”。所以应选择B)选项。
转载请注明原文地址:https://kaotiyun.com/show/nNDO777K
0

成人本科学位英语

相关试题推荐
随机试题
最新回复(0)