2. 专升本
  3. Companies usually______a number of experiments before a new product is launched.

Companies usually______a number of experiments before a new product is launched.

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问题 Companies usually______a number of experiments before a new product is launched.
选项 A、practice
B、control
C、carry
D、conduct
答案D
解析 practice：练习，实践；control：控制，管理；carry：运送，携带；conduct：实施，执行。根据句意可知，选D。
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