2. 专升本
  3. It will______another five to ten years before the new medicine can be tested on human beings.

It will______another five to ten years before the new medicine can be tested on human beings.

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问题 It will______another five to ten years before the new medicine can be tested on human beings.
选项 A、cost
B、spend
C、take
D、waste
答案C
解析
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