2. 专升本
  3. 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.

admin2015-04-14  28
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
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