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  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 句意：在一项新产品发布前公司通常会进行一些试验。practice练习，实践；control控制；carry运送，携带；conduct实施，执行。
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